Mixed 10% and 25% salt solution and received 3 kg of 20% salt solution. How much of each solution was used?

x kg 10% solution,

kg 25% solution.

0.1 x + 0.25 y = 0.2 (x + y)

0.1 x + 0.25 y = 0.2 x + 0.2 y

0.1 x = 0.05 y

x = 0.5 y

2 x = y

Answer: The ratio of 10% and 25% solution should be 1: 2, 1 kg of 10% solution and 2 kg of 25% solution

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