A machine puts c caps on bottles in m minutes. How many hours will it take to put caps on b bottles  Select the correct option: A) 60bm/c B) bm/60c C) bc/60m D) 60b/cm E) None of these
Explanation:   Substitute sensible numbers and work out the problem. Then change the numbers back to letters. For example if the machine puts 6 caps on bottles in 2 minutes, it will put 6 /2 caps on per minute, or (6 /2) x 60 caps per hour. Putting letters back this is 60c/m.If you divide the required number of caps (b) by the caps per hour you will get time taken in hours. This gives bm/60c   Answer: bm/60c
<result>B</result>
A machine puts c caps on bottles in m minutes. How many hours will it take to put caps on b bottles