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A ream of identical papers containing 500 sheets is 5 cm thick. How many sheets of this type of paper would be there in a 7.2 cm thick bundle?
A thickness of 5 cm holds 500 sheets, so 1 cm holds $$\frac{500}{5} = 100$$ sheets. Hence a 7.2 cm bundle holds $$100 \times 7.2 = 720$$ sheets.
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