Question
Brandon wanted to cut small identical 5 cm by 3 cm rectangles from a rectangular cardboard measuring 21 cm by 20 cm. What is the maximum number of complete small rectangles Brandon could cut? (Note: Brandon could rotate the small rectangle.)
3 m

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Brandon wanted to cut small identical 5 cm by 3 cm rectangles from a rectangular cardboard measuring 21 cm by 20 cm. What is the maximum number of complete small rectangles Brandon could cut? (Note: Brandon could rotate the small rectangle.)