Question
Six identical rectangular parcels are packed into a rectangular box with a width of 60 cm. The top view of two possible arrangements are shown below. The first arrangement shown leaves gaps of 21 cm and 16 cm. The second arrangement shown leaves a 31 cm gap. What is the length of the other gap in the second arrangement?
4 m

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Six identical rectangular parcels are packed into a rectangular box with a width of 60 cm. The top view of two possible arrangements are shown below. The first arrangement shown leaves gaps of 21 cm and 16 cm. The second arrangement shown leaves a 31 cm gap. What is the length of the other gap in the second arrangement?