math
posted by Ro on .
a boy is walking at dusk and notices his shado from a nearby street light. the boy is 5 feet tall and the street light is 12 feet above the ground. When the boy is 4 feet from the base of the street light how long will his shadow be?

draw a diagram. If the shadow has length s,
s/5 = (s+4)/12
s = 20/7