Question

a book has a front and a back and 400 pages the front and back cover are each 0.9mm thick, measured to 1 decimal place. each page is 0.13mm thick measured to 2 decimal places calculate the thickness of the book?

Answer 1

$Thickness \:of \:front \: and \:back \: cover \\of \:each = 0.9 \:mm$

$Thickness \:of \:each \:page = 0.13 \:mm$

$Number \: of \:pages \: in \:the \: Book = 400$

$Total \: thickness \: of \:the \:Book \\= 2 \times front \: page + 400 \times each \:page \: thickness\\= 2\times 0.9 \:mm + 400 \times 0.13 \\= 1.8 \:mm + 52\:mm \\= 53.8 \:mm$

Therefore.,

$\red { Total \: thickness \: of \:the \:Book} \green {= 53.8 \:mm}$

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Answer 2

Answer:

Thickness of front and back cover of each =0.9mm

thickness of each page = 0.13mm

number of pages in the book =400

total thickness =

2×0.9+400×0.13

1.8+ 52

53.8mm