Mixtures & Alligation · Question 30 · Hard
How many litres of an 80% sanitiser solution must be mixed with 30 litres of a 35% solution to get a 50% solution?
- 20 litres
- 10 litres
- 15 litres
- 45 litres
Answer and explanation
Answer: C. 15 litres
Explanation: By alligation, 80% part : 35% part = (50 − 35) : (80 − 50) = 15 : 30 = 1 : 2. With 30 L of the 35% solution, 15 litres of the 80% solution are needed.
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