Subject: mathqa
Question: a dishonest milkman wants to make a profit on the selling of milk . he would like to mix water ( costing nothing ) with milk costing rs . 33 per litre so as to make a profit of 25 % on cost when he sells the resulting milk and water mixture for rs . 36 in what ratio should he mix the water and milk ?
Option: 
A: 1 : 4
B: 1 : 10
C: 1 : 20
D: 21 : 124
Answer: D