Three drums X, Y and Z each contained some oil.

Nancy transferred `1/5` of the oil from X to Y, then poured `1/5` of the oil from Y to Z and finally transferred `1/5` of the oil from Z to X.

Right now, there are 64 litres of oil in each drum.

How much oil was there in each drum initially?

Notes to student:

1. If the question above has parts, (e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12
2. All answers to be given in litres.