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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: