In what ratio water be mixed with milk costing Rs.12 per liter to obtain a mixture worth of Rs.8 per litre?	Select:
A) 2 : 7 B) 1 : 2 C) 2 : 9 D) 2 : 2 E) 2 : 6

Rationale: answer with explanation : by the rule of allegation , i . c . p of 1 liter of water = 0 ii . c . p of 1 liter of milk = 12 iii . mean price ( p ) = 8 iv . d – m = 12 - 8 = 4 v . m – c = 8 - 0 = 8  ratio of water and milk = 4 : 8 = 1 : 2 answer : b
Answer: B