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

A    20

B    25

C    30

D    50

Solution

Correct Answer: 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.

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