A 240 gallons solution contains milk and water in the ratio 5:4. How many gallons of water must be added so that the ratio of milk and water in the resulting solution is 4:5?
A. 40
B. 48
C. 52
D. 60
E. 65

• Let X be the number of gallons of water added so that the ratio of milk and water changes to 4:5 from 5:4.
  Amount of milk in the initial solution= 5/9 × 240 gallons
  Amount of milk in the final solution= 4/9 x (240 + X)gallons
  Since there is no change in the content of the milk we have
  5/9 × 240 = 4/9 x (240 + X)
  i.e. X = 60 gallons
  Hence, option (D).
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