Question: I need a clearer understanding of how to solve: Two girls each got 1/6 of the 24 liters of water. Then a boy got 6 liters of water. How many liters of water were left?
Answer: 
Each of the girls got 24 x 1/6 = 4 liters of water.
So the two girls got a total of 4 x 2 = 8 liters.
Thus, a total of 8 + 6 = 14 liters of water were gotten by the two girls and the boy.
Therefore, 24 - 14 = 10 liters of water were left.