Question

24 is 20% of what number

Answer 1

24 is 20% of 120 

Convert your percentage into a decimal:
$\frac{20}{100} = 0.2$

Divide 24 by your decimal:
$\frac{24}{0.2} = 120$

Answer 2

0.2n=24

0.2 is the decimal form of 20%
n is the number we need to find

0.2n=24
-----   ----
0.2    0.2
n=120