1. Apple 1- 1/6=5/6

2. After selling four baskets of pears, there is still 4/6 left (because the ratio of apples to pears is 5: 4 after selling).

3.4/(3/4-4/6)=48 baskets (3/4-4/6 is the corresponding percentage of selling 4 baskets).

4.48*3/4=36 baskets.

There are 48 baskets of apples and 36 baskets of pears.

Checking calculation: 48-48* 1/6=40 baskets, 36-4=32 baskets. 40:32=5:4。