Francine can read 24 pages in 30 minutes.How can you mentally calculate the number of pages she can read in 45 minutes

it must be 1 1/2 times as much, or 24+12 pages.

To mentally calculate the number of pages Francine can read in 45 minutes, we can use proportionality.

First, we need to find the ratio of pages read to time elapsed. In this case, Francine reads 24 pages in 30 minutes. We can express this ratio as 24/30.

To find the number of pages Francine can read in 45 minutes, we can set up a proportion using the ratio we calculated:

24/30 = x/45

To solve for x (the number of pages Francine can read in 45 minutes), we can cross-multiply and solve for x:

30x = 24 * 45

Now, we can simplify:

30x = 1080

Divide both sides of the equation by 30:

x = 1080/30

Simplifying further:

x = 36

Therefore, Francine can read 36 pages in 45 minutes.