It took 7.2 minutes to upload 8 digital photographs from your computer to a website. At this rate, how long will it take to upload 20 photographs? How do I set this problem up?

Question

02-11-2016
Mathematics

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It took 7.2 minutes to upload 8 digital photographs from your computer to a website. At this rate, how long will it take to upload 20 photographs? How do I set this problem up?

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glennzhang98 glennzhang98 · Answer 1 · 2016-11-03T00:04:06+01:00

If it take some x minutes to upload some y digital photographs, it means it has an average of: x/y minutes to upload a single digital photograph. Then, to upload z photographs, you just multiply x/y by z.

Spoilers for answer:
If it take 7.2 minutes to upload 8 digital photographs, it means it has an average of: 7.2/8 = 0.9 minutes to upload a single digital photograph. This means that, by this rate, it will take 20 * 0.9 = 18 minutes to upload 20 photographs to the website.