A vessel is full of mixture of spirit and water in which there is 20 per cent of spirit. 5 litres are drawn off and the vessel is filled up with water. If the spirit is now 12 %, find the total quantity in the vessel (in ltrs).
Explanation:
Let the total mixture be x liters.
It contains 20 % spirit i.e.0.2 of the total mixture.
When 5 liters are drawn off, quantity of spirit removed = 0.2(5) = 1 liters.
Remaining spirit = 0.2x –1.
Also remaining spirit = 0.12x. ∴ 0.2x - 1 = 0.12x ⇒ x = 12.5L.
Hence, option 2 is the correct answer.
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By: Amit Kumar