4 years ago

If a 36-inch yardstick casts a 21-inch shadow, how tall is a building with a 168 foot shadow?

Mathematics

1 answer:

frozen [14]4 years ago

4 0

The sun must be very low in the sky, as a 24foot building would cast the 168-foot shadow.

Explanation:

Always be careful that the units of your calculation are consistent. It is a common trick in word problems to see if you are attentive.
It is best to stay in feet rather than inches in this problem.
The 36 inches is equal to 3 ft.

I prefer to just use a proportion to solve:
<span>3/21</span> = <span>x/168</span> Using cross products we calculate x = 24 ft

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