Melanie draws with great fervor, using up pencils at an incredible rate: 14 pencils every 4/9 of an hour. how many pencils does she use up in an hour?

If you would like to know how many pencils does Melanie use up in an hour, you can calculate this using the following steps:

14 pencils ... 4/9 of an hour = 4/9 of 60 minutes = 4/9 * 60 = 80/3 minutes
x pencils = ? ... one hour = 60 minutes

14 * 60 = 80/3 * x       /*3
14 * 60 * 3 = 80 * x
80 * x = 2520            /80
x = 2520 / 80
x = 31.5 pencils

The correct result would be 32 pencils in one hour.

Cbottom left is the correct one.