Question 147688
1) Pour from 20 into 14 filling it. Leaves 6 in the 20
2) Pour from 14 into 8 filling it. Leaves 6 in the 14
3) Drink the 8 oz contents
4) Pour 6 from the 20 into the 8

If you cant drink any
1) pour from 20 into the 8. leaves 12 and 8
2) Pour from other 20 into the 14. leaves 6 and 14
3) Pour 12 into 6. leaves empty and 18
4) Pour 8 into empty. Leaves empty 8 and 8 in 20
5) Pour from 14 into 8 until 8 is full. leaves 8 and 14 with 6 in it (one done)
6) Pour from 8 into 18 until full. Leaves 6 in 8 (other one done) and a full 20.

When we are done, we have a full 20, 6 in 8, 6 in 14 and 8 in the other 20. total 40. we are golden.