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Four robots built a roller coaster in 14 days. How long would it take a team of 7 robots to build the same roller coaster?

4 robots build a roller coaster in 14 days.  How long would it take a team of 7 robots to build the same roller coaster?
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1 Answer

Let's call a "robot-day" the amount of work one robot can do in one day.
 
For 4 robots to build a roller coaster in 14 days takes (4 robots)*(14 days) = 56 robot-days.
 
For a team of 7 robots to build this same 56-robot-day roller coaster takes 8 days. 
   [56/7,  because (7 robots)*(8 days) = 56 robot-days]