SOLUTION: How many liters of a 15% solution must be mixed with 20 liters of a 45 % solution to obtain a 25% solution?? My instructor shows us a box of 9 squares to solve this problem. It do

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Question 905467: How many liters of a 15% solution must be mixed with 20 liters of a 45 % solution to obtain a 25% solution?? My instructor shows us a box of 9 squares to solve this problem. It does not make sense to me, is there another easier way??

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
I enjoy doing those type problems but please post one at a time.
0.15*x+0.45*20=0.25(20+x)
0.15*x+9=5+0.25x
0.15x-0.25x=5-9
-0.1x=-4
x=40 gal of 15% is added to 20 gal of 45% to get 60 gal at 25%
check
0.15*40+0.45*20=0.25(20+40)
6+9=0.25(60)
15=15
ok