Question 593099
How much Brand A fruit punch (20% fruit juice) must be mixed with 8 L of Brand B fruit punch (50% fruit juice) to create a mixture containing 40% fruit juice? 
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let x=liters of Brand A fruit punch to be mixed with 8 liters of Brand B fruit punch
x+8=liters of the mixture
..
20%x+50%*8=40%(x+8)
.2x+4=.4x+3.2
.2x=.8
x=4 liters
ans:
liters of Brand A fruit punch to be mixed with 8 liters of Brand B fruit punch=4