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A dairyman pays Rs. 6.40 per litre of ...

A dairyman 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 a. 1 : 10 b. 1 : 12 c. 1 : 15 d. 1 : 20

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