Proportions

by Taylor Keteltas
(New York)

A novelist can type 240 words per minute. How long will it take for her to type 10,000 words?

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Proportions

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Dec 21, 2010
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by: Karin

Wow! We have a fast typist!

If she can type 240 words per minute, then we can divide: 10000/240 to get 41.67 minutes.

You can set this problem up as a proportion.

words 240 10000
----- ----- = ------
minute 1 x

If you cross multiply you get:

240x = 10000

Then divide both sides by 240.

240x = 10000
---- -----
240 240

x = 41.67 minutes.

I hope this helps!

Karin

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