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| Question 1111662:  60, 30, 20, 15,
 Answer by KMST(5328)
      (Show Source): 
You can put this solution on YOUR website! 60, 30, 20, 15, 12.5, 11.25, ... 
 The first differences for 60, 30, 20, 15 are
 60 - 30 = 20,
 30 - 20 = 10,
 20 - 15 = 5
 Each difference is half of the difference before.
 The next differences would be
 
  , 
  , etc. so, the next two terms are
 
  and  .
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