X= 19

3. Let the radius of the excircle be r.

Annular area = outer circle area-inner circle area

2πR=62.8

Inner ring area =πr? =π×8×8

External circle area =πR?

Solve the equation to get the answer.

There are y apple trees and x pear trees.

So: 4/5 x=80

2/3 y=4/5 x

y= 150