Arturo O. answered • 02/25/18

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x = liters of 50% alcohol

15 - x = liters of 100% alcohol

(50%)x + (100%)(15 - x) = (60%)(15)

Solve for x.

-50x = -600

x = -600/-50 = 12

15 - x = 3

**You need 12 liters of 50% alcohol, and 3 liters of 100% alcohol.**