188. Drum X is 1/2 full of oil and drum Y, which has twice the capacity of drum X, 2/3 full of oil.?

188. Drum X is 1/2 full of oil and drum Y, which has twice the capacity of drum X, 2/3 full of oil.

If all of the oil in drum X is pored into drum Y. then Drum Y will be filled to what fraction of its capacity?

a. 3/4

b. 5/6

c. 11/12

d. 7/6

E. 11/6

I chose E. 11/6 but it is incorrect.

The correct answer is 11/12

can someone help me break this one down step by step? help! thanks