Number of trees on of the land Joe owns = 250 trees
Total Number of trees on the whole land Joe owns =
= 1000 trees
Area of land covered with 10 trees = 1000
Area of land covered with 1 tree =
= 100 square feet
Therefore, Total land covered with 1000 trees = 1000 100
= 100,000 square feet
Since 1 acre = 43560 square feet
So, Total acres of land owned by Joe =
= 2.29 acre
= 2.3 acre
So, Joe owns 2.3 acres of land.