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Three pastures X, Y and Z have some horses grazing in them.
The ratio of the number of horses in pasture X to the number of horses in pasture Y is 8 : 7.
The ratio of the number of horses in pasture Y to the number of horses in pasture Z is 2 : 3.
Pasture Z has 75 more horses than pasture X.
Find the total number of horses grazing in pastures X and Y.