Question

When 9 times a number is increased by 30 the answer is the same when 140 is decreased by the number find the number

Answer 1

The unknown number = 11

Explanation:

Let

The unknown number = x

9 times a number is increased by 30

= 9x + 30

140 is decreased by the number

= 140 - x

9x + 30 = 140 - x

Collect like terms

9x + x = 140 - 30

10x = 110

x = 110 / 10

x = 11

Check:

9x + 30

9(11) + 30

= 99 + 30

= 129

140 - x

= 140 - 11

= 129