A jar can 20 litre milk. From the jar, 4 litres milk was taken out and replaced with an equal quantity of water. If 4 litres of the newly formed mixture is taken out of the can, then what is the final quantity of milk left in the can?

This can be solved as 20 1 - 4 20 2 = 20 1 - 1 5 2 = 20 4 5 2 = 20 16 25 = 64 5 = 12 . 8

Correct Answer: 12.8 lit

Explanation:

This can be solved as

$20 1 - \frac{4}{20} 2 = 20 1 - \frac{1}{5} 2 = 20 \frac{4}{5} 2 = 20 \frac{16}{25} = \frac{64}{5} = 12.8$

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