Question 164480
X+.75(5-X)=.9*5
X+3.75-.75X=4.5
.25X=4.5-3.75
.25X=.75
X=.75/.25
X=3 GALLONS OD 100% SOLUTION.
PROOF:
3+.75(5-3)=.9*5
3+.75*2=4.5
3+1.5=4.5
4.5=4.5