Number series: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
Look at the series carefully! 80, 10, 70, 15, 60. If you ignore 10 in between, you will realize, 10 is deducted from 80 and so the 3rd number is 70. Then again skip 15, and again 10 is deducted from 70 and so the 5th number is 60. This means that the 10 deducts on each odd number(1st, 3rd, 5th). Similarly, the 2nd number is 10, and the 4th is 15. We can say in each even number, we are adding a 5. so 10, 15th and 6th number will be 20.Therefore, A= 20 will be the answer.
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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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