Aptitude - Problems on Numbers - Discussion

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Q.

Look at this series: 80, 10, 70, 15, 60, ... What number should come next?                         
A. 20 B. 25
C. 30 D. 50

Answer: Option A
Explaination:

 


This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.




Discussion

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