Answer:
9 1/2 pounds
Explanation:
The total weight of apples picked so far is ...
4 2/3 + 5 5/6 = (4 +5) +(4/6 +5/6) = 9 + 9/6 = 9 + 1 1/2 = 10 1/2
Then the weight of apples needed so the total is 20 pounds is ...
20 -10 1/2 = (20 -10) -1/2 = 9 1/2
They need to pick about 9 1/2 more pounds of apples to have 20 pounds altogether.