Find the wrong number in the following number series.

42, 47, 57, 72, 92, 115, 147

Correct option is C

Wrong number = 115
Pattern of series –
42 + 5 = 47
47 + 10 = 57
57 + 15 = 72
72 + 20 = 92
92 + 25 = 117
117 + 30 = 147