Lifestyle · Easy
Number of cups of coffee consumed daily in NYC
Estimate how many cups of coffee are consumed on an average weekday in New York City.
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Consumer Tech · Hard
Mass of all smartphones sold last year
Compute the total combined mass (in metric tons) of smartphones sold worldwide in the past calendar year.
Solve →Urban Systems · Medium
How many piano tuners operate in Chicago?
Estimate the number of full-time piano tuners that could sustainably operate in the Chicago metro area. Justify population assumptions, piano ownership rates, and servicing frequency.
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