SOLUTION: How many liters of 40% glycerin solution must be mixed with 10 liters of 80% glycerin to obtain 65% glycerin solution?

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Question 712102:
How many liters of 40% glycerin solution must be mixed with 10 liters of 80% glycerin to obtain 65% glycerin solution?
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
.80*10+.40X=.65(X+10)
8+.40X=.65X+6.5
.40X-.65X=6.5-8
-.25X=-1.5
X=-1.5/-.25
X=6 LITERS OF 80$ SOLUTION IS USED.
PROOF:
.80*10+.40*6=.65(6+10)
8+2.4=.65*16
10.4=10.4