Question 164110
10*.08=(10-X).25
.8=2.5-.25X
.25X=2.5-.8
.25X=1.7
X=1.7/.25
X=6.8 KG MUST BE EVAPORATED.
pROOF
10*.8=(10-6.8).25
.8=3.2*.25
.8=.8