patterns-counting by 5's

Quiz yourself by guessing what should be in each of the black rectangles below before clicking on it to display the answer.
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Series
Missing Number
5, 10, ____, 20   15  
25, 30, 35, ____   40  
45, 50, ____, 60, 65   55  
5, 10, 15, ___, 25   20  
45, 50, 55, 60, ___   65  
75, 80, ___, 90   85  
85, 90, ___, 100   95  
60, 65, ___, 75, 80   70  
30, ___, 40, 45   35  
55, ___, 65, 70   60  


   

 
 

 
 

 

 

 
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