There are three trees in the town square. The tallest tree is 150 feet tall. The middle height tree is 2/3 the height of the tallest tree. The shortest tree is half the size of the middle tree.  How tall is the shortest tree?
Tallest Tree: <<150=150>>150 feet
Middle Tree:150(2/3)=300/3=100 feet
Shortest Tree:100/2=<<100/2=50>>50 feet
#### 50