A mixture of 70 litres of milk and water contains 10% water. How many litres of

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A mixture of 70 litres of milk and water contains 10% water. How many litres of water should be added to the mixture so that the mixture contains 12 1/2% water?

Answer: Option A

Quantity of milk in the mixture = 90/100 (70) = 63 litres.After adding water, milk would form 87 1/2% of the mixture.Hence, if quantity of mixture after adding x liters of water, (87 1/2) / 100 x = 63 => x = 72Hence 72 - 70 = 2 litres of water must be added.

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