Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
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?

### Response:
The tallest tree is 150 feet tall.
The middle tree is 2/3 of 150 feet, or <<150*(2/3)=100>>100 feet tall.
The shortest tree is half of 100 feet, or <<100/2=50>>50 feet tall.
#### 50

