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    Hi guys could anyone take a look at question 3b. This question just seems weird and i dont understand where they got the answer from.

    Will post questions below.

    Thanks
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    2 strips -> 4 strips makes 1.508 to 1.329 which is a difference of 0.179 (0.18 in answer)
    4 strips -> 8 strips makes 1.329 to 1.282 which is a difference of 0.047 (0.05 in answer)
    \frac{0.047}{0.179} \approx 0.39.. \approx \frac{1}{3} so that's the reduction in difference of area each time. Then just keep reducing the answer based on this pattern giving you some answer within 1.25-1.27 which would be acceptable.

    In an exam, you would (hopefully) not be asked to give such logic seeing as it's not really 1/3rd difference change.

    Hope this helped (and I hope I didn't misunderstand the book either)
 
 
 
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