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Jug X, Y and Z each contained some water.
Maggie transferred `1/4` of the water from jug X into jug Y, then poured `1/4` of the water from jug Y into jug Z, and finally transferred `1/4` of the water from jug Z to jug X.
Now, there are 9 litres of water in each jug.
Find the amount of water in each jug at first.
Notes to student: