Question 435904
The average length of time that 3 lawn service mowers operate on a given day is 930 minutes. None of the mowers operates for less than 900 minutes. What is the greatest possible length of time any of the mowers operates? 
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If one is the max, it occurs when the other 2 are a minimum
The total is 3*930 = 2790 minutes
900 + 900 + Max = 2790
Max = 990 minutes