SOLUTION: You have 5 cups of a drink that contains 57% caffeine, How many cups of a drink Containing 37% Caffeine easily added In order To have a final drink a 42% Caffeine?

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Question 1137278: You have 5 cups of a drink that contains 57% caffeine, How many cups of a drink Containing 37% Caffeine easily added In order To have a final drink a 42% Caffeine?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
0.57%2A5%2B0.37x=0.42%28x%2B5%29-----this accounts for amount of caffeine between the parts to be mixed, and the final mixture. x is how many cups of the 37%.