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Three packets X, Y and Z each contained some coffee powder.

Jenny transferred `1/7` of the coffee powder from X to Y, then transferred `1/7` of the coffee powder from Y to Z and finally

transferred `1/7` of the coffee powder from Z to X.

In the end, there were 36 g of coffee powder in each packet.

How much coffee powder was there in each packet initially?

Notes to student:

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