A person with a height of 7 feet is standing 70 feet from a street light. If the person's shadow is 35 feet, determine the height of the street light in feet.

Question

A person with a height of 7 feet is standing 70 feet from a street light. If the person's shadow is 35 feet, determine the height of the street light in feet. (Please do not enter the units in your answer.) 

Answer 1

answer is 21 = height of the street light

the problem creates 2 right triangles, one has sides 7 and 35, the other h and 70+35 the ratios are equal 7/35 = h/105, h= 7(105)/35 = 21