Imagine a question and stream-of-consciousness explanation for which this is the answer: 55
Question: Frank is walking through a corn maze. He has already spent 45 minutes inside. He has done 4 other corn mazes and finished those in 50 minutes on average. How much longer can he spend inside if he wants to ensure that his average doesn't go above 60 minutes per maze?
Stream-of-consciousness: He needs to keep his total time at 300 or below because 5 x 60 = 300. His total time spent in the other mazes is 200 because 4 x 50 = 200. His total time spent in the five mazes thus far is 245 because 200 + 45 = 245. He can spend 55 more minutes on this maze before his average go above 60 because 300 - 245 = 55.