MATH word prob!

how many gallons of 70% alcohol solution must be mixed with 30 gallons of 23% solution to obtain a solution that is 60% alcohol?

How do I solve this problem?

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  1. let the amount to be added be x gal

    .7x + .23(30) = .6(30+x)
    times 100
    70x + 23(30) = 60(30+x)
    70x + 690 = 1800 + 60x
    10x = 1110
    x = 111 gallons

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    posted by Reiny
  2. Together a baseball and a football weigh 2.25 pounds, the baseball and a soccer ball weigh 1.25 pounds, and the football and the soccer ball weigh 2.50 pounds. How much does each of the balls weigh?

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    posted by kelly

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