Pouring alcohol

100 liters of alcohol has 70%
How many liters of water needs to be added to have 60% alcohol?

Correct answer:

x =  16.6667

Step-by-step explanation:

100 • 0.70 = 0.6 • (100+x)

0.6x = 10

x = 50/3 ≈ 16.666667

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