Question

81 is 54% of what number?

Answer 1

`81 = (54)/(100)*x to x = 100/54*81 = 150`

Explanation:

Percentages are fractions out of 100 of something. In this case, 54% is `54/(100ths)` of an unknown number, which we can call `x`. This is equal to 81.

`54/100*x=81`

Rearranging to make `x` the subject and solving:

`x=81*100/54 = 150`

Answer 2

`150`

Explanation:

`81=x(54/100)`

`rarr81/x=54/100`

Cross multiply:

`rarr81*100=54x`

`rarr8100=54x`

`rarrx=8100/54=4050/27=1350/9=450/3=150`