Question

Need help with solving #10 please.

Answer 1

Set up a proportion:
6 pages              ? pages
 _______   =      _______       
8 minutes         20 minutes

Cross products 6 x 20 = 120 then 120/8 = 15.
So she read 15 pages in 20 minutes. The answer is A

Answer 2

You can use the ration 6:8 to show she reads 6 pages in 8 minutes.
Simplify this ratio first.
6:8 -> 3:4
Now just multiply the 4 by 5 to get 20 pages and the 3 by 5 as well to see how long it takes her to read those 20 pages.
3 • 5 = 15
It will take Frida 15 minutes to read 20 pages.