Question 1050875
An auto mechanic has two bottles of battery acid. One contains a 10%
solution and the other a 4% solution. How many cubic centimeters (cc) of each
solution must be used to make 120 cubic centimeters of a solution that is 6%
acid? 
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This is a problem many auto mechanics have to solve.
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t = amount of 10%
f = amount of 4%
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t + f = 120  -- total solution
10t + 4f = 6*(t + f)  -- total acid