A milkman adds 10 litres of water to 90 litres of milk. After selling \(\frac{1}{5}\) of the total…
The new proportion of water to milk is 28 : 72. The 100-litre mixture is 10% water, so selling one-fifth (20 litres) removes 2 litres of water and 18 litres of milk, leaving…
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A milkman adds 10 litres of water to 90 litres of milk. After selling of the total quantity, he adds water equal to the quantity he sold. The proportion of water to milk he sells now would be:
Answer and explanation
Correct answer B
The new proportion of water to milk is 28 : 72. The 100-litre mixture is 10% water, so selling one-fifth (20 litres) removes 2 litres of water and 18 litres of milk, leaving 8 litres of water and 72 litres of milk. Adding 20 litres of water gives 28 litres of water and 72 litres of milk. 72 : 28 is the same pair taken as milk to water; 30 : 70 treats the 20 litres sold as pure milk, and 20 : 80 counts only the water added after the sale.
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Common Management Admission Test (CMAT)