Prova De Matemática 7 Ano
Avaliação de matemática - Problemas envolvendo equações de 1ºgrau.
Questions and Answers
- 1.
01) A soma de um número mais 49 é 108. Qual é esse número?
- A.
49
- B.
59
- C.
39
- D.
69
Correct Answer
B. 59Explanation
To find the number, we need to subtract 49 from 108 since the sum of the number and 49 is 108. Therefore, the number is 59.Rate this question:
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- 2.
02) O triplo de um número, mais 5, é igual a 254. Qual é esse número?
- A.
81
- B.
88
- C.
73
- D.
83
Correct Answer
D. 83Explanation
To find the number, we need to subtract 5 from 254 to get 249. Then, we divide 249 by 3 to find the number. The result is 83, which is the correct answer.Rate this question:
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- 3.
03) O dobro de um número adicionado a 5, é igual a 34 mais esse número. Qual é esse número?
- A.
29
- B.
15
- C.
34
- D.
28
Correct Answer
A. 29Explanation
The question states that the double of a number added to 5 is equal to 34 plus that number. To find the number, we can set up an equation. Let's represent the number as "x". The equation would be: 2x + 5 = 34 + x. Simplifying this equation, we get x = 29. Therefore, the number is 29.Rate this question:
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- 4.
04) A metade de um número mais esse número é igual a 3. Qual é esse número?
- A.
4
- B.
1
- C.
2
- D.
3
Correct Answer
C. 2Explanation
The question is asking for a number that when added to half of itself equals 3. The only number that satisfies this condition is 2. If we take half of 2, which is 1, and add it to 2, we get 3. Therefore, the correct answer is 2.Rate this question:
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- 5.
05) A diferença do quíntuplo de um número com o seu triplo, é igual a 16. Qual é esse número ?
- A.
8
- B.
16
- C.
14
- D.
18
Correct Answer
A. 8Explanation
The question asks for a number that, when multiplied by 5 and then subtracted by its triple, equals 16. In other words, we need to solve the equation 5x - 3x = 16. Simplifying this equation gives us 2x = 16, and dividing both sides by 2 gives us x = 8. Therefore, the number is 8.Rate this question:
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- 6.
06) A soma do dobro de um número mais 12 é igual a esse número. Quanto ele vale?
- A.
12
- B.
- 10
- C.
13
- D.
- 12
Correct Answer
D. - 12Explanation
The correct answer is -12. This can be determined by setting up an equation based on the given information. Let's assume the number is represented by x. According to the problem, the equation would be 2x + 12 = x. By subtracting x from both sides and simplifying, we get x = -12. Therefore, the value of the number is -12.Rate this question:
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- 7.
07) A terça parte de um número é igual a 27. Qual é esse número?
- A.
81
- B.
7
- C.
9
- D.
10
Correct Answer
A. 81Explanation
The question states that the third part of a number is equal to 27. The only option that satisfies this condition is 81, as when you divide 81 by 3, you get 27. Therefore, the number in question is 81.Rate this question:
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- 8.
08) Um número mais sua metade é igual a 30. Qual é esse número?
- A.
20
- B.
30
- C.
35
- D.
15
Correct Answer
A. 20Explanation
The correct answer is 20. This can be determined by setting up the equation "x + x/2 = 30" where x represents the unknown number. Solving this equation, we can simplify it to "3x/2 = 30" and then multiply both sides by 2/3 to get "x = 20". Therefore, the number is 20.Rate this question:
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- 9.
09) A soma de um número mais o seu triplo equivale a 120. Qual é esse número?
- A.
60
- B.
22
- C.
30
- D.
40
Correct Answer
C. 30Explanation
The question states that the sum of a number and its triple is equal to 120. To find the number, we need to solve the equation. Let's assume the number is x. So, the equation becomes x + 3x = 120. Simplifying this equation gives us 4x = 120. Dividing both sides by 4, we get x = 30. Therefore, the number is 30.Rate this question:
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- 10.
10) Quanto vale um número que somado a 29 é igual ao dobro desse número mais 1?
- A.
- 13
- B.
- 28
- C.
29
- D.
28
Correct Answer
D. 28Explanation
To find the value of the number, we can set up an equation. Let's assume the number is x. The equation would be x + 29 = 2x + 1. By simplifying and solving the equation, we find that x = 28. Therefore, the value of the number is 28.Rate this question:
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