Remark.
There are a couple of ways to do this. The easiest might be to find out just how many 1/6 and 1/4 equals.
If there are 12 slices, then 1/4 * 12 = 3
And again if there are 12 slices, then 1/6 * 12 = 2
Jeremiah ate 2 pieces
Jessie ate 3
The total of what was eaten = 2 + 3 = 5
There were 12 pieces. 5 were eaten 12 - 5 = 7. There are 7 left. <<< answer