In what ratio must water be mixed with milk to gain 16 2/3 % by selling the mixture at cost price?
Options:
A .  1:6
B .  2:3
C .  4:3
D .  6:1
Answer: Option A
Let the C.P of the milk be Re. 1 per litre Then S.P of 1 litre of mix =Re 1, Gain% =50/3% C.P of 1 Litre of Mix =Rs(100 x 3/350 x 1) =Re 6/7 Ratio of water and milk =1/7 = 6/7 = 1: 6
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