Q. The number of words an average eraser can rub off would be___?
Assumption:
1) Size of an average eraser is 5cm*2cm*1cm.
2) The eraser is completely used.
Calculation:
After erasing a sheet, the length of the rubber is reduced by 5mm. Assuming that we can write about 500 words on a single sheet of paper.
Length of rubber reduced by 1 word= .0001cm.
Total number of words that can be erased= 5/.0001 =50,000 words
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