Question

Sarah can read 1 1/2 pages in 3 minutes. How many pages can she read in 9 minutes?

Answer 1

4 1/2

Explanation:

Set up a ratio

`( 1 1/2)/x = 3/9`

`1 1/2` = the part of pages

x = the total number of pages

3 = the part of the time

9 = the total time.

Solve for x

`( 1 1/2)/x xx x = 3/9 xx x` this gives

`1 1/2 = 3/9 xx x` multiply both sides by the inverse 9/3

`3/2 xx 9/3 = 3/9 xx 9/3 xx x` which results in

`9/2 = x` This is the same as

`4 1/2 = x`