Answer:
Farmer George has painted
OR
this morning.
Explanation:
Number of Chicken coops to be painted = 3
Amount of painting left =

can Rewritten as

Amount of painting left =

We need to find the amount of chicken coops painted,
Amount of chicken coops painted can be calculated by Subtracting Amount of painting left with Number of Chicken coops to be painted.
Amount of chicken coops painted =

Taking LCM we get;
Amount of chicken coops painted =

can be written in mixed fraction as

Hence Farmer George has painted
OR
this morning.