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1. A milkman mixed some water with milk to gain 25% by selling the mixture at the cost price. The ratio of water and milk is respectively -

Solution:
Cost price of 1 litres of milk = Rs. 100
∴ Mixture sold for Rs. 125
= 125100 = 54 litres
∴ Quantity of mixture = 54 litres
∴ Quantity of milk = 1 litre
∴ Quantity of water = 54 - 1 = 14 litre
∴ Required ratio = 14 : 1 = 1 : 4

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