Algebra from OG

Drum X is 1/2 full of oil and drum Y, which twice the capacity of drum X, is 2/3 full of oil. If all the oil in drum X is poured into drum Y, then drum Y will be filled to what fraction of its capacity?

1- 3/4
2- 5/6
3- 11/12
4- 7/6
5- 11/6