Question 306553
.04*9+.10x=.06(9+x)
.36+.10x=.54+.06x
.10x-.06x=.54-.36
.04x=.18
x=.18/.04
x=4.5 liters of 10% solution is used.
Proof:
.04*9+.10*4.5=.06(9+4.5)
.36+.45=.06*13.5
.81=.81