At a loading dock, each worker on the night crew loaded 3/4 as many boxes as each worker on the day crew. If the night crew has 3/4 as many workers as the day crew, what fraction of all the boxes loaded by the two crews did the day crew load?	Choose the correct choice.
A) 3 / 5  B) 4 / 5  C) 11 / 15  D) 16 / 25  E) 19 / 25

Rationale: "let x be the number of workers on the day crew . let y be the number of boxes loaded by each member of the day crew . then the number of boxes loaded by the day crew is xy . the number of boxes loaded by the night crew is ( 3 x / 4 ) ( 3 y / 4 ) = 9 xy / 16 the total number of boxes is xy + 9 xy / 16 = 25 xy / 16 the fraction loaded by the day crew is xy / ( 25 xy / 16 ) = 16 / 25 the answer is d ."
Answer: D