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A mixture of 40 l of milk and water contains 10 % water. How much water should be added to it so that…

The 40 litres contain 4 litres of water and 36 litres of milk. If \( x \) litres of water are added, \( \tfrac{4 + x}{40 + x} = 0.2 \), so \( 4 + x = 8 + 0.2x \) and \( x =…

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A mixture of 40 l of milk and water contains 10 % water. How much water should be added to it so that water may be 20 % in the new mixture?

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Correct answer A

The 40 litres contain 4 litres of water and 36 litres of milk. If x x litres of water are added, 4+x40+x=0.2 \tfrac{4 + x}{40 + x} = 0.2 , so 4+x=8+0.2x 4 + x = 8 + 0.2x and x=5 x = 5 .

Check: 9 litres of water in 45 litres is 20 per cent.

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