Question

30%of what number is 9 find the whole

Answer 1

Line up % with % and number with number

30% is 9
100% is ?

Those numbers are in proportion so we can cross multiply to find the missing part of the proportion.

?=100•9/30=30

So 30% of 30 is 9

Answer 2

We can set up a proportion to find the answer.


`(9)/(x) = (30)/(100)`

Cross multiply


`9(100) = 30x`

Solve for x


`x = (900)/(30)`

x = 30

So 9 is 30% of 30.

The answer is 30.