Look at this series: 80, 10, 70, 15, 60, . . . What number

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Look at this series: 80, 10, 70, 15, 60, . . . What number should come next?

1. 20
2. 25
3. 30
4. 50

Correct Option: A

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.