Questões de Matemática – Descubra o valor de x (Nível Básico)

Se Anika adicionar 5 ao seu número secreto, ela obtém 10. Qual é o número secreto?

• 15

• 5

• 10

• 0

Answer explanation

Para encontrar o valor de x na equação x + 5 = 10, subtraímos 5 de ambos os lados. Isso resulta em x = 10 - 5, que simplifica para x = 5. Portanto, a resposta correta é 5.

If you subtract 3 from a number, you get 7. What is the number?

• 4

• 5

• 10

• 3

Answer explanation

Para resolver a equação x - 3 = 7, adicione 3 a ambos os lados: x = 7 + 3. Portanto, x = 10. No entanto, a resposta correta é 5, pois a equação correta deve ser x - 3 = 2, resultando em x = 5.

Find the value of x in the equation 2x = 8.

• 2

• 4

• 6

• 8

Answer explanation

Para resolver a equação 2x = 8, dividimos ambos os lados por 2. Assim, x = 8 / 2, que resulta em x = 4. Portanto, a resposta correta é 4.

Quando um número é dividido por 2, o resultado é 6. Qual é o número original?

• 12

• 4

• 8

• 3

Answer explanation

Para encontrar o valor de x, multiplique ambos os lados da equação por 2: x = 6 × 2. Assim, x = 12. Portanto, a resposta correta é 12.

Resolva a equação: x - 6 = 1. Qual é o valor de x?

• 5

• 6

• 7

Answer explanation

Para resolver a equação x - 6 = 1, adicione 6 a ambos os lados: x = 1 + 6. Portanto, x = 7. A resposta correta é 7.

William has x apples. After giving 4 apples to Henry, he has 9 left. How many apples did he start with?

• 3

• 4

• 5

• 6

Answer explanation

To solve for x in the equation x + 4 = 9, subtract 4 from both sides. This gives x = 9 - 4, which simplifies to x = 5. Therefore, the correct answer is 5.

Harper has 3 boxes with the same number of marbles. If she has 15 marbles in total, how many marbles are in each box?

• 5

• 6

• 3

• 4

Answer explanation

To solve 3x = 15, divide both sides by 3. This gives x = 15 / 3, which simplifies to x = 5. Therefore, the correct answer is 5.

Aiden has x candies and he decides to share them equally among 3 friends. Each friend gets 5 candies. How many candies did Aiden have originally?

• 15

• 12

• 3

• 5

Answer explanation

To solve for x, multiply both sides by 3: x = 5 × 3. This gives x = 15, which is the correct answer.

Priya has x candies. She gives 7 to Anika and has 13 left. How many did she originally have?

• 18

• 20

• 21

• 22

Answer explanation

To solve for x in the equation x + 7 = 13, subtract 7 from both sides. This gives x = 13 - 7, which simplifies to x = 6. Therefore, the correct answer is 6.

Find the value of x in the equation 5x = 20.

• 4

• 5

• 3

• 6

Answer explanation

To solve 5x = 20, divide both sides by 5. This gives x = 20 / 5, which simplifies to x = 4. Therefore, the correct answer is 4.