Mixtures Alligation

Fresh grapes contain 90% water while dry grapes contain 20% water. What is the weight of dry grapes obtained from 20 kg fresh grapes?

  1. 2 kg
  2. 2.4 kg
  3. 2.5 kg
  4. 10 kg

Answer

The weight of non-water in 20 kg of fresh grapes (which is 100-90=10% of total weight) will be the same as the weight of non-water in x kg of dried grapes (which is 100-20=80% of total weight).

20*0.1 = x*0.8

x = 2.5

The correct option is C.