Question

40 is 0.08 of what number

Answer 1

0.08 is 8%
0.08 × 100 = 8%

40 is 8% of what?
40 = 0.08x

`(40)/(0.08) = (0.08x)/(0.08)`
8 and 8 cancels out
x = 500

check
500 × 0.08 = 40

Answer 2

40 = 0.08 x
so x = 40/0.08
x = 500
40 is 8% of 500