Look at this series 80, 10, 70, 15, 60. What number should come next?
Correct answer: A. 20
- A. 20
- B. 25
- C. 30
- D. 50
Explanation
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. First pattern (80) (80 - 10 = 70) (70 - 10 = 60) (60 - 10 = 50). Second pattern (10) (10 + 5 = 15) (15 + 5 = 20) So the answer is a = 20.
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About Letter, Symbol and Number Series
Series questions use numbers, letters, symbols or combinations arranged according to a hidden pattern. You may need to identify repeated operations, alternating rules, alphabetical positions, differences, reversals and mixed sequences to find a missing term or predict the next one.
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