SOLUTION: How many liters of 80% alcohol must be mixed with 40 liters of 70% alcohol to produce a mixture that is 75% alcohol?

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Question 100507: How many liters of 80% alcohol must be mixed with 40 liters of 70% alcohol to produce a mixture that is 75% alcohol?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
x(80%)+40(70%)=(x+40)(75%) ... .8x+28=.75x+30 ... .05x=2 ... x=40