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