How much water should I add to 120 g of a solution with a mass fraction of salt of 20% to get a solution with a mass fraction of 15%?

bystudin | May 28, 2020 | Education

120 g of a 20% salt solution contains 120 * 0.2 = 24 g of salt
Let’s make the equation:
15% = 24 * 100% / (120 + x)
Solving, we get that x = 40 g

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