250 g of a solution with a mass fraction of salt of 12% and 300 g of a solution with a mass fraction of the same salt of 8%

250 g of a solution with a mass fraction of salt of 12% and 300 g of a solution with a mass fraction of the same salt of 8% were mixed. The mass of salt in the resulting solution is equal to

Salt mass = 250 * 0.12 + 300 * 0.08 = 54 g

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