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3 years ago

It took Laura 12.5 hours to read a 360 page book, how long would it take for her to read a 400 page book?

1 answer:

3 0

$\bf \begin{array}{ccll} hours&pages\\ \cline{1-2} 12&360\\ x&400 \end{array}\implies \cfrac{12}{x}=\cfrac{360}{400}\implies \cfrac{12}{x}=\cfrac{9}{10} \\\\\\ 120=9x\implies \cfrac{120}{9}=x\implies \cfrac{40}{3}=x\implies 13.\overline{3}=x$

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