10-10-2017
Mathematics

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A building across the street casts a shadow that is 24 feet long. Your friend is 6 feet tall and casts a shadow that is 4 feet long. What is the height of the building?

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jallen2409 jallen2409

10-10-2017

set it up as a proportion. start with the smaller numbers, 6 ft friend and 4 ft shadow. 4/6 reduces to 2/3. so 2/3= 24/x. the easiest way to finish the problem is to divide by 2, and multiply by 3. for instance- 24/2= 12. 12*3= 36, so the building is 36 feet tall. to check plug it back in, is 2/3= 24/36?

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