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Question

A container has 30 L of water. If 3 L of water is replaced by 3 L of spirit and this operation is repeated twice , what will be the quantity of water in the new mixture?

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Solution

Actually the question in other way is saying that 10% of water from solution of water is removed .
So According to question , Quantity of water in new mixture = $30 \times \frac{9}{10} \times \frac{9}{10}$ $= 24.3 L$

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litre mixture of milk and water contains milk and water in the ratio

3 : 2

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litres of the mixture is removed and replaced with pure milk and the operation is repeated once more.

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