At a certain time of day a 5 foot talk man has a 7.5 foot shadow. If a tree is 20 feet tall what is the length of the shadow?
A 30 feet
B12 feet
C 24 feet
D 15 feet

Question

At a certain time of day a 5 foot talk man has a 7.5 foot shadow. If a tree is 20 feet tall what is the length of the shadow? 
A 30 feet 
B12 feet 
C 24 feet 
D 15 feet

irishboy123 · Answer

draw some triangles.  put the sun as the point source of light, beaming down on us.  draw a man and a tree at the same point on a horizontal surface, some way beneath the sun/point source.

clearly it does not have to be to scale but this is one way that you will find these kind of problems really easy to solve.

anonymous · Answer

Okay thanks

irishboy123 · Answer

seriously, draw them here if that helps.  we are all here to help each other, dude.

anonymous · Answer

ahaha I know really thank you

anonymous · Answer

5/7.5=20/x
This is how I set up the equation for the problem.