4, 7, 25, 10, __, 20, 16, 19. What number should fill the blank?

A. 13

B. 15

C. 20

D. 28

Answer: Option A

Solution(By Examveda Team)

Two series alternate here, with every third number following a different pattern. In the main series, 3 is added to each number to arrive at the next. In the alternating series, 5 is subtracted from each number to arrive at the next.