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you buy two rolls of wrapping paper. each roll has the same lateral surface area. what is the diameter of roll B?
The area of lateral surface is equal that the perimeter multiply by the length. So the lateral surface area of roll A is 3*π*30=90π. Roll B: d*π*24=24dπ. Put them together: 90π=24dπ. So d=3.75 in.
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