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A lamppost casts a shadow of that is 15 yards long. A 3-foot-tall mailbox casts a shadow that is 5 yards long. How tall is the lamppost?
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5 votes
A lamppost casts a shadow of that is 15 yards long. A 3-foot-tall mailbox casts a shadow that is 5 yards long. How tall is the lamppost?

User Alexmcfarlane
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2 Answers

5 votes
1/5 = x/15 solve for x
15 * 1/5 = 15/5 = 3
it is 3 yards tall

(I changed the 3 feet to 1 yard to keep the units the same)
User Dorphalsig
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7.7k points
2 votes
Use the proportion x/15 = 3/5 (height of object/length of shadow) and cross multiply. 5x = 45. divide both sides by three and x=9.
User Johneth
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8.5k points
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