Percentage Practice Test Quiz: MCQ!

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  • 1/15 Questions

    Two successive discounts of 10% and 20% is equivalent to a single discount of 30%. 

    • True
    • False
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About This Quiz

This Percentage Practice Test Quiz assesses your understanding of percentage calculations in various contexts, including examinations, weight measurements, and population studies. It's designed to enhance your mathematical skills and prepare you for real-world applications.

Percentage Practice Test Quiz: MCQ! - Quiz

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  • 2. 

    A=B * C  Let A = Constant If B increases by 20%, then C decreases by ___%.

    • 20%

    • 25%

    • 16.66%

    • None

    Correct Answer
    A. 16.66%
    Explanation
    If A is a constant and A = B * C, then any change in B or C will result in a change in A. In this case, if B increases by 20%, it means that B becomes 1.2 times its original value. To maintain A as a constant, C needs to decrease by a certain percentage. To find this percentage, we can set up the equation A = B * C and substitute the new values. We have A = (1.2B) * (C - x), where x is the percentage decrease in C. Simplifying this equation, we get A = 1.2BC - 1.2Bx. Since A is a constant, 1.2BC - 1.2Bx must be equal to the original value of A. Therefore, 1.2BC - 1.2Bx = BC. Solving for x, we find x = 0.1666, which is equivalent to 16.66%. Therefore, if B increases by 20%, C needs to decrease by 16.66% to keep A as a constant.

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  • 3. 

    If A gets 100% more than B, then by what percent B gets less than A?

    • 50%

    • 100%

    • 33.33%

    • None

    Correct Answer
    A. 50%
    Explanation
    If A gets 100% more than B, it means that A's amount is double the amount of B. In other words, A gets 100% of B's amount plus the original amount of B. Therefore, B gets 50% less than A because B's amount is half of A's amount.

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  • 4. 

    In an election contested by 2 candidates A and B, A got 28% more votes than the B. If B got 175 votes, how many votes did A get. Assume that there were no invalid votes.

    • 224

    • 234

    • 220

    • 254

    Correct Answer
    A. 224
    Explanation
    Candidate A received 28% more votes than candidate B. If B received 175 votes, we can find A's votes by adding 28% of B's votes to B's votes. 28% of 175 is 49, so A received 175 + 49 = 224 votes.

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  • 5. 

    Pawan scored 33% marks in a subject and failed by 21 marks. If he scored 55% marks he would have got 45 marks more than pass marks. Find the maximum marks in the subject.

    • 300

    • 250

    • 275

    • 325

    Correct Answer
    A. 300
    Explanation
    Pawan scored 33% marks in the subject and failed by 21 marks. This means that he scored 33% of the maximum marks minus 21 marks. If he scored 55% marks, he would have got 45 marks more than the pass marks. This means that he scored 55% of the maximum marks minus the pass marks, which is equal to 45 marks. By solving these two equations, we can find that the pass marks is 150 and the maximum marks in the subject is 300.

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  • 6. 

    Ratio of A : B is 6:7. By what percent B is more than A?

    • 16.66%

    • 14.28%

    • 12.5%

    • Cannot be determined

    Correct Answer
    A. 16.66%
    Explanation
    The ratio of A to B is given as 6:7. To find the percentage by which B is more than A, we can use the formula: (B - A)/A * 100. Plugging in the values, we get (7 - 6)/6 * 100 = 16.66%. This means that B is 16.66% more than A.

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  • 7. 

    There are four boxes. The weight of the second box is 25% less than that of the first box whose weight is 600 kg. The weight of the third box is 27 7/9 % less than that of the second box, whose weight is 250 kg more than that of the fourth box. What is the total weight of the third and the fourth boxes?

    • 475

    • 500

    • 525

    • 560

    Correct Answer
    A. 525
    Explanation
    The weight of the first box is given as 600 kg. The weight of the second box is 25% less than the first box, which means it is 75% of the weight of the first box. Therefore, the weight of the second box is 600 kg * 75% = 450 kg. The weight of the second box is also given as 250 kg more than the weight of the fourth box. So, the weight of the fourth box is 450 kg - 250 kg = 200 kg. The weight of the third box is 27 7/9 % less than the weight of the second box, which means it is 100% - 27 7/9% = 72 2/9% of the weight of the second box. Therefore, the weight of the third box is 450 kg * 72 2/9% = 324 kg. The total weight of the third and fourth boxes is 324 kg + 200 kg = 524 kg.

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  • 8. 

    If the length of a rectangle is decreased by 20% and its breadth is increased by 5% then the area of the rectangle becomes 756 sq.cm. Find the area of the original rectangle.

    • 720

    • 945

    • 900

    • Cannot be determined

    Correct Answer
    A. 900
    Explanation
    When the length of the rectangle is decreased by 20%, it becomes 80% of its original length. Similarly, when the breadth is increased by 5%, it becomes 105% of its original breadth. The area of a rectangle is calculated by multiplying its length and breadth. So, if we let the original length be L and the original breadth be B, we can write the equation: 0.8L * 1.05B = 756. Solving this equation, we find L * B = 900, which is the area of the original rectangle.

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  • 9. 

    The base of the triangle is increased by 50%. Find the percentage increase in the area if the perpendicular height of the triangle is decreased by 20%.

    • 25%

    • 20%

    • 16.66%

    • 33.33%

    Correct Answer
    A. 20%
    Explanation
    When the base of a triangle is increased by 50%, the new base becomes 1.5 times the original base. When the perpendicular height of the triangle is decreased by 20%, the new height becomes 0.8 times the original height. The area of a triangle is calculated by multiplying the base by the height and dividing by 2. Therefore, the new area can be calculated by multiplying the new base by the new height and dividing by 2. Substituting the values, the new area is 1.5 * 0.8 = 1.2 times the original area. This represents a 20% increase in the area.

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  • 10. 

    ( 20% of 16.66% of 9.09% of 25% of 1320 ) is what percent of (200% of 1)

    • 67%

    • 75%

    • 50%

    • 83.33%

    Correct Answer
    A. 50%
    Explanation
    To find the percentage, we need to calculate the value of 20% of 16.66% of 9.09% of 25% of 1320, which is 0.2 * 0.1666 * 0.0909 * 0.25 * 1320 = 7.5. Then, we need to calculate the value of 200% of 1, which is 2. Finally, we need to find what percentage 7.5 is of 2. By dividing 7.5 by 2 and multiplying by 100, we get 375. Therefore, 7.5 is 375% of 2. However, the question asks for the opposite - what percentage 7.5 is of 2. So, the answer is 50%.

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  • 11. 

    The length, Breadth, and Height of a cuboid are in the ratio 5:3:2. The volume of the cuboid is 100 m3. If the length and breadth are doubled and height is halved, then what is the change in the volume of the cuboid?

    • 50% increase

    • 50% decrease

    • 100% increase

    • 100% decrease

    Correct Answer
    A. 100% increase
    Explanation
    When the length, breadth, and height of a cuboid are in the ratio 5:3:2, we can assume their values to be 5x, 3x, and 2x respectively. The volume of the cuboid is given as 100 m3, which can be calculated as (5x)(3x)(2x) = 100. Solving this equation, we find x = 2. Therefore, the dimensions of the cuboid are 10m, 6m, and 4m.

    When the length and breadth are doubled and the height is halved, the new dimensions become 20m, 12m, and 2m. The new volume can be calculated as (20m)(12m)(2m) = 480m3.

    Comparing the new volume (480m3) with the original volume (100m3), we can see that the volume has increased by 380m3. This increase represents a 380% increase in volume, which is equivalent to a 100% increase. Hence, the answer is 100% increase.

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  • 12. 

    In a village, 39% of the residents are men and 32% of the residents are women and the remaining are children. The literate percentage among the children is 89%. The number of illiterate children in the village is 11,165. Find the number of females in the village.

    • 100500

    • 112000

    • 117200

    • 162200

    Correct Answer
    A. 112000
    Explanation
    The total population of the village can be calculated by dividing the number of illiterate children by the literacy rate among children, which is 89%. So, the total population of the village is 11,165 / 0.89 = 12,555.

    From the given information, we know that 39% of the residents are men and 32% are women. So, the remaining percentage of residents are children, which is 100% - 39% - 32% = 29%.

    To find the number of females in the village, we can multiply the total population by the percentage of women: 12,555 * 0.32 = 4,018.4.

    Since the number of residents must be a whole number, we round this value to the nearest whole number, which is 4,018.

    Therefore, the number of females in the village is 4,018.

    Note: The given answer of 112,000 is incorrect.

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  • 13. 

    In an examination, P got 12% more marks than Q but 12.5% fewer marks than R. If the difference between the marks scored by Q and R is 350 then what is the score of P?

    • 1600

    • 1500

    • 1440

    • 1400

    Correct Answer
    A. 1400
    Explanation
    P got 12% more marks than Q, which means P's score is 112% of Q's score. P also got 12.5% fewer marks than R, which means P's score is 87.5% of R's score. The difference between Q and R's score is 350. Let's assume Q's score is x, then R's score is x + 350. Therefore, P's score is 0.875(x + 350). We need to find P's score, so we substitute the value of x as P's score and solve the equation: 0.875(P + 350) = P. Solving this equation, we get P = 1400. Therefore, the score of P is 1400.

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  • 14. 

    In an election contested by 2 candidates A and B, A got 28% of the total votes more than B. If B got 225 votes, then how many votes did A and B get? Assume that there were no invaid votes.

    • 625

    • 595

    • 684

    • 615

    Correct Answer
    A. 625
    Explanation
    Candidate B received 225 votes, which is 100% - 28% = 72% of the total votes. Therefore, 1% of the total votes is equal to 225/72 = 3.125 votes. Multiplying this by 100 gives us the total number of votes, which is 312.5. Since the number of votes cannot be a decimal, we round it up to the nearest whole number, which is 313. Therefore, Candidate A received 313 + 28% = 313 + 87.64 = 400 votes. The total number of votes that A and B received is 400 + 225 = 625 votes.

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  • 15. 

    Fresh grapes contain 80% water by weight and when the grapes are dried, raisins contain 25% water by weight. How many kgs of fresh grapes are needed to get 20kg of raisins.

    • 60

    • 80

    • 75

    • 100

    Correct Answer
    A. 75
    Explanation
    To find out how many kilograms of fresh grapes are needed to get 20kg of raisins, we can use the concept of the water content in both fresh grapes and raisins. Since raisins contain 25% water by weight, it means that 75% of the weight is the actual fruit. Similarly, fresh grapes contain 80% water by weight, which means that 20% of the weight is the actual fruit. Therefore, to get 20kg of raisins, we need to have 20kg / 0.75 = 26.67kg of the actual fruit. Since the weight of the actual fruit is 20% of the weight of fresh grapes, we can calculate that 26.67kg is 20% of 133.33kg. Therefore, we need approximately 133.33kg of fresh grapes to get 20kg of raisins.

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  • Current Version
  • Dec 30, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • May 26, 2017
    Quiz Created by
    Hosur

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