Farmer stone is quite an eccentric dairy farmer.
he originally had a total 54 gallons of milk in three churns and he wanted to make
sure each churn contained 18 gallons of milk.
in order to do this, he did the following:
first he poured 1/4 of the first churn in the second
churn.
he then poured 1/2 of the second churn into the third churn.
finally he poured 1/3 of the third churn into the first churn.
how many gallons did each churn contain before farmer stone started pouring?