Question

An object 4.2 feet tall casts a shadow that is 12.6 feet long. How long in feet would the shadow be for an object which is 20.4 feet tall?

a.12 feet
B.6.8 feet
C.28.8 feet
d.61.2 feet

Answers

Ms. Sue
Let's use a proportion.

4.2/12.6 = 20.4/x

Cross multiply and solve for x.

Damon
height/shadow = 4.2/12.6 = 20.4 /x

4.2 x = 12.6 * 20.4
x = 12.6 * 20.4 / 4.2
x = 61.2

check, the shadow should be about three times as long as the object is high in this problem. It is.
a
61.2=12.6 * 20.4

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