A mixture of 30 litres of milk and water contains milk and water in the ratio 7 : 3. How much water must be added to it so that the ratio of the milk and water in the new mixture may be reversed?

40 litres

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35 litres

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30 litres

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25 litres

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Solution

The correct option is A 40 litres
b'In the original mixture, Milk = 21 litres and water is 9 litres. In the new mixture, theratio of milk and water is 3 : 7. Since milk contents remain the same in both the mixtures so $21 : x = 3 : 7 ⟹ x = 49$
Hence water to be added $= 49 - 9 = 40 l i t r e s$ '

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