2 litres of a 30% salt solution are mixed with 8 litres of a 40% salt solution. What is the concentration of the mixture?

Answer and explanation

Correct answer: D. 38%

  1. Step 1: Salt = 2x30/100 + 8x40/100 litres-equivalent.
  2. Step 2: Concentration = (60+320)/10 = 38%.
Answer
38%.
Why not the others: 35%, 43% and 23.75% do not fit.

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