Posted by Max on Sunday, October 21, 2012 at 2:46am.
the floodlight is 6.1m tall. Jonny's height is unknown,though his shadow is 2m long when he stands 3m from the base of a floodlight.
What is the height of jonny?

maths  Bosnian, Sunday, October 21, 2012 at 5:56am
H = Height
3 m + 2 m = 5 m
Proportion :
H / 2 = 6.1 / 5 Multiply both sides by 2
H = 6.1 * 2 / 5 = 12.2 / 5 = 2.44 m