Task: Question Answering
Input (English): Problem: a dishonest person wants to make a profit on the selling of milk . he would like to mix water ( costing nothing ) with milk costing 33 $ per litre so as to make a profit of 70 % on cost when he sells the resulting milk and water mixture for 36 $ . in what ratio should he mix the water and milk ? 
Options: a ) 1 : 120 , b ) 67 : 120 , c ) 67 : 8 , d ) 8 : 120 , e ) 1 : 2
Output (English): b