1.
90% of 80
Explanation
To find 90% of 80, we can multiply 80 by 0.9. This is because 90% is equivalent to 0.9 as a decimal. Multiplying 80 by 0.9 gives us 72, which is the correct answer.
2.
10% of 50
Explanation
To find 10% of 50, we divide 50 by 10. This gives us 5. Therefore, 10% of 50 is equal to 5.
3.
138% of 10
Explanation
The expression "138% of 10" means finding 138% (or 1.38 times) of the number 10. To calculate this, we multiply 10 by 1.38, which gives us the result of 13.8. Therefore, the correct answer is 13.8.
4.
90% of 40
Explanation
To find 90% of 40, we multiply 40 by 0.90. This gives us 36, which is the answer.
5.
30% of ___ =18
Explanation
In order to find 30% of a number, we can multiply the number by 0.3. So, if 30% of a number is equal to 18, we can set up the equation 0.3 * x = 18, where x is the number we are trying to find. Solving for x, we divide both sides of the equation by 0.3, resulting in x = 18 / 0.3. Simplifying this expression, we find that x = 60. Therefore, the number that satisfies the equation is 60.
6.
190% of ___ =19
Explanation
The equation 190% of 10 equals 19 can be solved by finding the value that, when multiplied by 190% (or 1.9), results in 19. Dividing 19 by 1.9 gives us the value of 10, which satisfies the equation. Therefore, the missing number is 10.
7.
90% of ___ = 72
Explanation
If 90% of a number is equal to 72, we can find the whole number by dividing 72 by 0.9 (which is equivalent to 90%). This calculation gives us 80, which means that the original number is 80.
8.
160% of ___ = 48
Explanation
To find 160% of a number, we can multiply the number by 1.6. So if 160% of a number is equal to 48, we can set up the equation 1.6x = 48, where x is the unknown number. Dividing both sides of the equation by 1.6, we find that x = 30. Therefore, the missing number is 30.
9.
____% of 110 =77
Explanation
To find the percentage of a number, we divide the given number by 100 and then multiply it by the percentage value. In this case, we need to find what percentage of 110 is equal to 77. So, we can set up the equation: x% of 110 = 77. To solve for x, we divide both sides of the equation by 110, giving us x = (77/110) * 100. Simplifying this, we get x ≈ 70. Therefore, 70% of 110 is equal to 77.
10.
___% of 100 =10
Explanation
The given equation is a percentage calculation. The question is asking what percentage of 100 is equal to 10. To solve this, we need to find the number that, when multiplied by 100 and divided by 100, gives us 10. In this case, the answer is 10, as 10 multiplied by 100 and divided by 100 equals 10.
11.
____% of 90=36
Explanation
The given equation is asking for what percentage of 90 is equal to 36. To find this, we need to divide 36 by 90 and then multiply the result by 100 to convert it into a percentage. When we perform this calculation, we get 40. Therefore, 40% of 90 is equal to 36.
12.
___% of 140=14
Explanation
The given equation can be solved by setting up a proportion. We can write the equation as x% of 140 is equal to 14. To find the value of x, we can cross multiply and solve for x. Cross multiplying gives us 140x = 14 * 100. Simplifying further, we get 140x = 1400. Dividing both sides by 140 gives us x = 10. Therefore, the answer is 10.