A milk seller has certain quantity of milk to sell. In what ratio, should he mix water to gain 5% by selling the mixture at the cost price ?  Choose the correct choice
A) 1:10 B) 1:5 C) 1:20 D) 1:15 E) None of these
Let Cost price of 100 g milk was Rs. 100.   x +5% of x = 100   x + 0.05x = 100   1.05x = 100   x = 100/1.05 = 95.23   Water = 100 - 95.23 = 4.76   Ratio of water and Milk = 4.76 /95.23 = 1/20 = 1 : 20.   ANSWER : 1:20
<result>C</result>
A milk seller has certain quantity of milk to sell. In what ratio, should he mix water to gain 5% by selling the mixture at the cost price ?