Mixtures & Alligation · Question 12 · Hard
80 litres of a solution contains 30% acid. How much pure acid must be added to make it a 44% acid solution?
- 20 litres
- 16 litres
- 18 litres
- 24 litres
Answer and explanation
Answer: A. 20 litres
Explanation: Acid = 24 L. (24 + x)/(80 + x) = 0.44 gives 24 + x = 35.2 + 0.44x, so 0.56x = 11.2 and x = 20 litres.
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