Subject: General Aptitude · Chapter: Profit and Loss · Exam: 2006 · Marks: · Difficulty:
Five litres of water is added to a certain quantity of pure milk costing ₹ 3 per litre. If by selling the mixture at the same price as before, a profit of 20\% is made, then what is the amount of pure milk in the mixture?
(a)20 litres
(b)25 litres
(c)30 litres
(d)35 litres
Answer
Answer (as printed): B
Explanation
Mean cost price $=₹\left(\frac{100}{120} \times 3\right)=₹ \frac{5}{2}$. By the rule of alligation: $$\text { ∴ } \text { Ratio of water and milk }=\frac{1}{2}: \frac{5}{2}=1: 5 .$$ So, required quantity of milk $=(5 \times 5)$ litres $=25$ litres.
Explanation as extracted from the printed page; notation may be imperfect.