PQOTD 8/11/09

A machine puts c caps on bottles in m minutes. How many hours will it take to put caps on b bottles? A. 60bm/c B. bm/60c C. bc/60m D. 60b/cm E. b/60cm  Here is a good example of a question that is made easier by substituting values for the variables. Let’s say the machine puts on [...]