Question 1144217
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The diameter of the first winding is 4cm; the diameter of the last winding is 10.5cm.  The diameter of an average winding is the average of those two diameters, 7.25cm.<br>
The length of the average winding is pi times the diameter of the average winding.<br>
The total length of the roll is 300 times the length of one sheet.<br>
The number of windings is the total length of the roll, divided by the length of the average winding.<br>
You can do the calculations.<br>
The answer is very close to one of the given answer choices.