Question

90% of what number is 135?

Answer 1

150

Explanation:

90% can be rewritten as 9/10.

We can represent the original number as the variable x and construct an equation that models the given situation.

`(9)/(10) \cdot x = 135`

Then, we can solve the equation for x by multiplying both sides by the reciprocal of 9/10, which is 10/9.

`(10)/(9)\left((9)/(10) \cdot x\right) = (135)\left((10)/(9)\right)`

`x = 10 \cdot (135)/(9)`

`x = 10\cdot 15`

`x = 150`