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The milk and water in a mixture are in the ratio 7 : 5. When 15 liters of water are added to it, the ratio of milk and water in the new mixture becomes 7 : 8. The total quantity of water in the new mixture is:

a) 35 litres
b) 40 litres
c) 60 litres
d) 96 litres

Answer: b
Explanation:
Milk   :   Water
7 : 5
7 : 8
    3 unit

Remember water is added and not milk, so make milk equal but here milk is already equal
3 units = 15 litres
1 units = 5 litres
8 units = 40 litres
Total quantity of water in the new mixture = 40 litres

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