Jon and Jim painted 2/3 of the fence.
Since Job painted 1/4 of the fence and Jim painted 5/12 of the fence, in order to get the total fraction of the fence that was painted, we'll need to add the fractions painted by both of them together and this will be:
= 1/4 + 5/12
Note that the LCM of 4 and 12 is 12
= 1/4 + 5/12
= 3/12 + 5/12
= 8/12
= 2/3
Therefore, both of them painted 2/3 of the fence.
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