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Mathematics 7 Online
OpenStudy (anonymous):

Suppose that the chain could go all the way around the planet. Then the chain's length would be equal to the circumference of the earth at the equator (about 24,000 miles). Assuming that the average adult arm span is 6 feet, how many people would it take to make this human chain? (Hint: Use 5280 feet = 1 mile.)

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