Six identical rectangular boxes can be stacked into a cupboard 90 cm wide. Two arrangements are shown below. The first arrangement in Figure A leaves a 42-cm gap at the top. The second one in Figure B leaves a 10-cm gap at the top and another gap at the side.

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(a) In the arrangement shown in Figure B, what is the width of the gap at the side?

(b) What is the height of the cupboard?

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