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Four volumes of the Transum Encyclopaedia are on a shelf as shown here. Billy the book worm begins at page one of the first volume and eats his way through to the last page of volume four. Calculate the length of his meal.
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Front cover 7mm thick Pages 2.5cm thick altogether Back cover 7mm thick |
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The answer is 9.2cm
Did you realise that page 1 of volume one is on the right side of the book, so the worm only chews through the front cover of volume one before starting on volume two?
The meal consists of: The front cover of volume one plus two times the thickness of a complete volume plus the back cover of volume four.
7mm + 2 x 3.9cm + 7mm