Question

How much water must be added to 60 litres of milk at 1.5 litres for Rs.20 so as to have a mixture worth Rs.10$\frac{2}{3}$ a litre?

• A. 10
• B. 12
• C. 15
• D. 18
• E. None

Answer 1

The correct option is C

15

C.P of 1 litre of milk =Rs.$\frac{40}{3}$

By formula of alligation, ratio of water and milk =$\frac{8}{3}:\frac{32}{3}=1:4$

Quantity of water to be added to 60 litres of milk =$\frac{1}{4}\times 60$=15 litres