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If a 12 shell cupboard requires 18 ft of wall space then how much wall space would a 30 cup shelf require?

45.

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Computer printer produces 176400 lines in a given day. If the printer is in operation for 7 hrs during the day how many lines did it print per minute?	A computer tape library there are two racks with 40 tapes per rack.In a given day 30 tapes are in use . What fraction remains in the rack?