Question

At a certain time of day, a person 6 ft tall casts a 4 ft shadow. How long is the shadow cast by a 21 ft tree at the same time? A. 12 ft B. 14 ft C. 19 ft D. 15 Ft

Answer 1

we have

6 ft of a person ----> 4 ft shadow

21 ft of a tree -------> x

`\begin{gathered} (6)/(21)=(4)/(x) \\ 6* x=21*4 \\ 6x=84 \\ (6x)/(6)=(84)/(6) \\ x=14 \end{gathered}`

answer: B. 14 ft