In what proportion must water be added with milk to get a gain of 20% by selling the mixture at cost price?
Answer & explanation
Correct answer: option 1
20% = \(\frac{1}{5}\)
As water is free, so there is the cost of milk only.
Milk cost = 5
Profit = 5 × \(\frac{1}{5}\) = 1
Water : Milk
1 : 5