A computer programmer needs to print 148 documents. The documents have an average (arithmetic mean) length of 10 pages and the printer takes 15 seconds to print each page. Approximately how many hours will it take to print all the documents if they are printed without interruptions?
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Quick one: total pages = 148 × 10, then convert seconds to hours. Got 4.1 hrs-ish and picked D. Anyone else round to 6?
Exactly what I did. The choices make rounding easy.
Wait, why do we need the average length at all? Couldn't they just give total pages?
It's basically a two-step setup: total pages, then rate conversion.
Got 4 hours and 6 minutes, closest is 6. Is D really the expected answer?
Approximation questions usually have one answer clearly closest.
Thanks, this was easier than I expected once I converted 15 sec/page to 240 pages/hour.
What it tests
Your ability to combine individual work rates, usually by working with the fraction of a job completed per unit of time.
Common trap
Adding the times instead of the rates, or forgetting to take the reciprocal when combining rates.