Madhya Pradesh Police Exam Model Paper 5

The pattern follows here is:Each term is decreased as a difference between them in a multiple of 3.
62 = First Term - 3
62=65−3
62=62
Now,
56 = Second Term - 6
56=62−6
56=56
Now,
47 = Third Term - 9
47=56−9
47=47
Now,
35 = Fourth Term - 12
35 = 47 - 12
35 = 35
Similarly,
x = Fifth Term - 15
x=35−15
x = 20.
Hence, the correct answer is "20".