Simple Equations — Chapter Test

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Write '7 more than x' as an expression.

7 more than x is x + 7.

To solve x + 5 = 9, you subtract ___ from both sides.

Subtracting 5 gives x = 4.

If 2x = 10 gives x = 5, then 3x = 15 gives x = ___ ?

x = 15 ÷ 3 = 5.

Write 'twice a number' as an expression.

Twice a number is 2x.

Solve: x + 8 = 20.

x = 20 − 8 = 12.

Solve: 4x = 36.

x = 36 ÷ 4 = 9.

Solve: x − 7 = 15.

x = 15 + 7 = 22.

Solve: 2x + 5 = 17.

2x = 12, so x = 6.

Solve: x/3 = 7.

x = 7 × 3 = 21.

Q10

Solve: 3x − 4 = 11.

3x = 15, so x = 5.

Q11

A number increased by 12 gives 30. What is the number?

x + 12 = 30, so x = 18.

Q12

Four pens cost ₹48. What is the cost of one pen?

4p = 48, so p = ₹12.

Q13

Solve: 5x + 3 = 28.

5x = 25, so x = 5.

Q14

The sum of a number and its double is 27. What is the number?

x + 2x = 27, so 3x = 27 and x = 9.

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