80 L of a mixture of milk and water contains 20% water. How much water must be added to make the water 50% in the mixture?

Problem Statement

Water = 20% of 80 = 16 L. Let x be water added: (16 + x) = 0.5(80 + x) → 16 + x = 40 + 0.5x → x = 24/(0.5) = 48.

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