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The number of chocolate boxes in carton X and the number of chocolate boxes in carton Y are in the ratio 10 : 7.
The number of chocolate boxes in carton Y and the number of chocolate boxes in carton Z are in the ratio 8 : 9.
The three cartons have a total of 3980 chocolate boxes.
On average, each chocolate box in carton Z has 50 bars of chocolates.
How many bars of chocolates does carton Z have?