Solutions, mixtures

How many liters of 70% solution must we add to 5 liters of 30% solution to give us a 60% solution?

Correct answer:

x =  15 l

Step-by-step explanation:


x · 0.70 + 5· 0.30 = 0.60 · (x+5)

0.1x = 1.5


x = 1.5/0.1 = 15

x = 15

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