A container contains 25 litre of milk. From this container, 5 litre of milk is taken out and replaced by water. This process is further repeated two times. How much milk is there in the container now?

Question

Question

This question was previously asked in

SSC CGL 2022 Tier-I Official Paper (Held On : 01 Dec 2022 Shift 3)

Answer 1

Given:

A container contains 25 litre of milk. From this container, 5 litre of milk is taken out and replaced by water.

Concept used:

Left Quantity = Initial Quantity(1 - [Fraction removed])^N (Where N = Number of times the process is carried out)

Calculation:

Fraction of milk removed = 5/25 = 1/5

Now, the quantity of milk left in the container

⇒ 25(1 - 1/5)³

⇒ 25 × (4/5)³

⇒ 25 × 64/125

⇒ 12.8 litre

∴ There is 12.8 litre of milk left in the container.

Shortcut Trick qImage682899e8ca923fdfc753d82d