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OpenStudy (anonymous):
Terrence answered 4 homework questions in 9 minutes. How long will it take him to answer twenty questions?
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geerky42 (geerky42):
20 question is 5 `4 homework questions`, right? Since he has to do 4 homeworks 5 times, you just multiply minutes by 5.
OpenStudy (anonymous):
its simple ^_^, solve it by basic method time taken for 4 questions = 9 minutes time taken for 1 question = 9/4 minutes and then time taken for 20 questions = \[9\div4\times20=9\times5=45 minutes \]
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