Final answer:
Jon and Jim have painted 11/12 of the fence, so 1/12 of the fence is left to paint.
Step-by-step explanation:
In order to find out how much of the fence is left to paint, we need to determine how much of the fence Jon and Jim have already painted.
Jon painted 1/3 of the fence and Jim painted 7/12 of the fence.
To find the total amount painted, we need to add these fractions together.
1/3 + 7/12
= 4/12 + 7/12
= 11/12
Therefore, Jon and Jim have painted a total of 11/12 of the fence.
To find out how much of the fence is left to paint, we subtract this amount from 1.
1 - 11/12
= 12/12 - 11/12
= 1/12
So, there is 1/12 of the fence left to paint.