Question

a man who is 5 feet tall stands 15 feet from a lamppost that is 27 feet high. how far away from the man is the tip of his shadow?

Answer 1

sorry i forgot to say that i don't need the answer... i need an equation or expression that models this situation.

Answer 2

s/(15+s) = 5/27

or

(15+s)/27 = s/5