A class sorted 45 books in 90 minutes. How long would it take to sort 120 books?

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asked Aug 3, 2015 223k views

2 votes

A class sorted 45 books in 90 minutes. How long would it take to sort 120 books?

Mathematics
middle-school

Naby asked

by Naby

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2 Answers

2 votes

45 * 2 2/3 = 120
90 * 2 2/3 =240
It would take 240 minutes to sort 120 books

Daniel Beer answered Aug 4, 2015

by Daniel Beer

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1 vote

$45 \ books\ in\ 90\ minutes\\\\ 120\ bookes\ in\ x\ minutes\\\\ making\ proportion\\ 45-90\\120-x\\\\cross\ multiplication\\\\ 45x=90*120\\\\ 45x=10800\ \ \ | divide\ by\ 45\\\\x=240\\\\ It\ will\ take\ 240\ minutes.$

Calvin Ferrando answered Aug 8, 2015

by Calvin Ferrando

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