Problema Solution
How much water must be evaporated from 60 kilograms of a 15% salt solution in order to obtain a 40% solution?
Answer provided by our tutors
Let x be the number of kilograms of water evaporated.
0.15*60=0.4(60-x).
9=24-0.4x.
0.4x=24-9.
0.4x=15.
x=15/0.4
=37.5 kilograms.