How is the length of the rack structure of AS / RS calculated where x, a and ny represent the dimensions of unit load, allowances for the load and number of load compartments?

How is the length of the rack structure of AS / RS calculated where x, a and ny represent the dimensions of unit load, allowances for the load and number of load compartments? Correct Answer W = ny (y + b)

The width of the rack structure of AS / RS calculated as: W = ny (y + b) where x, a and ny represent the dimensions of unit load, allowances need to given for unit loads in the storage system and number of loads along the length of the aisle.

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How is the width of the rack structure of AS / RS calculated where x and a are the dimensions of unit load and allowances?
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