Question

An alloy is made up of 10%zinc.what quantity in alloy from 12.5kg zinc?

Answer 1

quantity of zinc in alloy=10%
so 12.5kg =10% of alloy
let the quantity of alloy=x
$\frac{10x}{100} = 12.5 \\ 1250 = 10x \\ so \: x = 125kg$
so mass of alloy is 125kg