A mixture of 150 liters of wine and water contains 20% water. How much more water should be added so that water becomes 25% of the new mixture?  Options:
A) 7 liters B) 15 liters C) 10 liters D) 9 liters E) none of these

Rationale: "explanation : number of liters of water in 150 liters of the mixture = 20 % of 150 = 20 / 100 * 150 = 30 liters . p liters of water added to the mixture to make water 25 % of the new mixture . total amount of water becomes ( 30 + p ) and total volume of mixture is ( 150 + p ) . ( 30 + p ) = 25 / 100 * ( 150 + p ) 120 + 4 p = 150 + p = > p = 10 liters . answer is c"
Answer: C