While reading a book Sarah notices that she has read 3 pages after 10 minutes. If she keeps reading at this rate, how many pages will she have read in 1 hour?

Answer 1

"At the same rate" is very important..

In this problem, the rate may be pages per minute (or pages per hour) or it may be minutes per page.

Let x = how many pages Sarah will read in 1 hour (this is "pages per hour" rate).

(3 pages) / (10 minutes) = (x pages) / (60 minutes)

cross-multiply:

10x = 3*60

x = 18