Question

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Answer 1

$weight \: of \: 72 \: books = 9kg$

$weight \: of \: 1 \: book = \binom{9}{72}$

$weight \: of \: 40 \: books$

$\binom{9}{72} \times 40kg$

$= \binom{1}{8} \times 40kg$

$= \frac{40}{8}kg$

$= 5kg$

: 40 such books will weight 5kg.

$1000m = 1km$

$1m = \frac{1}{1000}$

$8m = 8 \times 1m$

$= 8 \times \frac{1}{1000} km$

$= 0.008km$

Answer 2

Answer:

0.008km

Explanation:

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