A mixture of 125 gallons of wine and water contains 20% of water. How much water must be added to the mixture in order to increase the percentage of water to 25% of the new mixture?  Choices
A) 10 gallons
B) 8.5 gallons
C) 8 gallons
D) 8.33 gallons
E) 9.33 gallons

Rationale: in 125 gallons of the solution there are 0.2 ∗ 125 = 25 gallons of water . we want to add w gallons of water to 125 gallons of solution so that 25 + w gallons of water to be 25 % of new solution : 25 + w = 0.25 ( 125 + w ) - - > w = 253 ≈ 8.33 . answer : d
Answer: D