Answer :

tmacar
60--------40%
15--------10%
150--------100%
60 = 40% * x
60 = 40/100x
60 = 4/10x
60 = 0.4x               / ÷ 0.4 (both sides)
x = 150

Doublecheck:

40% * 150 =
= 40/100 * 150 =
= 4/10 * 150 =
= 2/5 * 150 =
= 2/1 * 30 =
= 2 * 30 =
= 60

So it's correct :)

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