A milk man sells the milk at the cost price but he mixes the water in it and thus he gains 9.09%. The quantity of water in the mixture of 1 liter is :

• A. 90.90 ml
• B. 83.33 ml
• C. can't be determined
• D. 99.09 ml

Answer: (B)

Profit (%) = 9.09 % = 1/11   Since the ratio of water and milk is  1 : 11,   Therefore the ratio of water is to mixture = 1:12   Thus the quantity of water in mixture of 1 liter = 1000 x (1/12) = 83.33 ml