posted by Awesome1 on .
A flagpole is 20 feet tall and, in the afternoon, casts a shadow of 30 feet. At the same time, Keira casts a shadow of 7.5 feet. How tall is Keira? A. 3 feet. B. 4 feet. C. 5 feet. D. 5 feet
20' high : 30' shadow
? high : 7.5' shadow
This is a problem of direct proportions, the taller the object, the longer the shadow.
Keira's height can be found by cross multiplication,
H = 20*7.5/30 = 5 feet.
Also, please refrain from double posting the same problem within a short time. Allow some time for tutors to look at the problem.