Question 1174794
Michael types 250 words in 20 minutes.  This means he types 250/20 words...or 12.5 words...per minute.
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It will take Michael 7500/12.5 minutes...or 600 minutes...to type 7500 words.
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600 minutes is 600/60 hours...or 10 hours.
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<b>It will take Michael 10 hours to type 7500 words.</b>
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You could also do it like this:
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Michael types 250 words in 20 minutes.  
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This means he could type 750 words in 60 minutes.
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This means he could type 750 words in 1 hour.
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This means he could type 7500 words in 10 hours.