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Wikipedia says that the equator is about 40,075 Kilometers (24,901 miles) long; 78.7% is across water and 21.3% is over land. Estimate the number of people who holding hands in a human chain cover the length of the equator.

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After a three-hour drive, I stopped my car in front of a wall with three doors: a silver door on the left, a gold door in the middle, and an iron door on the right. Which door would I open first? John works 4-hour shifts at a call center. He earns $4 per hour and $4 per call. How many calls does he need to receive per shift to earn a total of exactly $400 in 4 shifts?