A 180 liter mixture of milk and water contains 20% water. How much milk, in liters, must be added to the mixture so that the new mixture will contain water and milk in the ratio of 1 : 7?

A 180 liter mixture of milk and water contains 20% water. How much milk, in liters, must be added to the mixture so that the new mixture will contain water and milk in the ratio of 1 : 7? Correct Answer 108 liters

Amount of water = 20/100 ×180 = 36 liter Amount of milk = 80 /100 ×180 = 144 liter Let, amount of milk to be added is x 36/(144 + x) = 1/7 144 + x = 252 x = 108
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