Question

If you know 40% of a number, explain how you could work out the original number.

Answer 1

Let the number n be 40%

=> n/40 = 1%

=> 100n/40 = 100%....the original amount.

In this case this becomes 2.5n.............as 2.5 x 40 = 100

Answer 2

thanks for the answer

Answer 3

yw:) thanks for the medal.

Answer 4

your welcome :)

Answer 5

let b be 40% of the number X.

\[\frac{ 40 }{ 100 }timesX=b\]
\[0.4timesX=b\]
\[X =\frac{ b }{0.4 }\]