Question 769005
make a proportion(tree height ==woman height)/(tree shadow length==woman shadow)
x(since do not know how tall tree is)=5 
--------------------------------------- ==> (x/7.5)=(5/3)
7.5>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>=3
now cross multiply:
3x=37.5
--=----
3 = 3
x=12.5
ANSWER: The tree is 12.5ft