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1) A diary man 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: (Plz explain how to do this)

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Dairyman would earn 25% profit, if only milk were sold at Rs 8 per liter.
Since the profit earned is 37.5% by selling milk and water, the additional 12.5% profit is due to selling only water.

12.5% of Rs 6.40 is 80p, which can buy 1/10th of a liter of milk from Diaryman.
Therefore, the proportion of water to milk received by the customers is 1:10.
 

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Deependra Verma

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