Jenny can type 1,200 words in 30 minutes. How long will it take her to type a 3,000-word essay?
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Time needed to type 1200 words=30 minutes.
Time needed to type 1 word=30/1200 minutes
Time needed to type 3000 words=30/1200×3000
=15 × 5 minutes
= 75 minutes
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