A milkman pays Rs. 6.40 per litre of milk. He adds water and sells the mixture at Rs. 8 per litre,…
The proportion of water to milk is 1 : 10. For 1 litre of milk, the cost is Rs. 6.40 and the revenue needed for a 37.5% profit is 6.40 × 1.375 = Rs. 8.80. At Rs. 8 per…
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A milkman pays Rs. 6.40 per litre of milk. He adds water and sells the mixture at Rs. 8 per litre, thereby making 37.5% profit. The proportion of water to milk received by the customers is :
Answer and explanation
Correct answer B
The proportion of water to milk is 1 : 10. For 1 litre of milk, the cost is Rs. 6.40 and the revenue needed for a 37.5% profit is 6.40 × 1.375 = Rs. 8.80. At Rs. 8 per litre, this requires 1.1 litres of mixture, containing 0.1 litre of water; hence water : milk = 0.1 : 1 = 1 : 10.
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