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Mathematics 5 Online
OpenStudy (anonymous):

A 20% acid solution is mixed with a 70% acid solution to get 100 liters of a 40% solution. If x = amount of 20% solution and y = amount of 70% solution, then 0.2x + 0.7y = _____ liters.

OpenStudy (kropot72):

The two terms in the equation represent acid quantities. Therefore the missing term of the equation is 100 * 40% = 40 liters

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