How many liters of 30% acid solution must be mixed with 20 L of 50% acid solution to get a 40% solution?

Problem Statement

Set up acid balance. Let x be liters of thirty percent. Acid: 0.3x + 0.5×20 equals 0.4(x+20). Solve: 0.3x + 10 = 0.4x + 8 ⇒ x = 20.

SolutionRead Only

0.3x+10 = 0.4(x+20) ⇒ x=20

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