# The book

The book has 280 pages. Each side is a rectangle with sides 15 cm and 22 cm.

a) how many leaves has the book?
b) at least how many square meters of paper should be used to production this book?

Result

a =  140
b =  4.62 m2

#### Solution:

$a = 280/2 = 140$
$b = a \cdot \ 0.15 \cdot \ 0.22 = 140 \cdot \ 0.15 \cdot \ 0.22 = \dfrac{ 231 }{ 50 } = 4.62 = 4.62 \ m^2$

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