Kevin has 3 bags of apples weighing a total of 22 1/2 pounds. two of the bags weigh 6 3/8 pounds and 3 1/4 pounds. how much does the third bag weigh?

First, you change 6 3/8 and 3 1/4 to a common denminator. 8

6 3/8= 6 3/8
3 1/4= 3 2/8 (x2)

Then add those.

6 3/8+ 3 2/8 = 9 5/8

Then subtract 22 1/2 and 9 5/8. (Common denominator)

22 1/2= 22 4/8 (x4)
9 5/8= 9 5/8

the 3rd bag is 12 7/8 lbs.

You can also add each bag (lbs) to see if it gets to 22 1/2
Hope this helps!