Question 246507
.04*10+.10x=.06(10+x)
.4+.10x=.6+.06x
.10x-.06x=.6-.4
.04x=.2
x=.2/.04
x=5 liters of 10% solution is used.
Proof:
.04*10+.10*5=.06(10+5)
.4+.5=.06*15
.9=.9