Subject: mathqa
Question: at a loading dock , each worker on the night crew loaded 2 / 3 as many boxes as each worker on the day crew . if the night crew has 5 / 6 as many workers as the day crew , what fraction of all the boxes loaded by the two crews did the day crew load ?
Option: 
A: 9 / 14
B: 6 / 11
C: 8 / 13
D: 7 / 12
Answer: A