A number pattern is shown below.
120, 105, 130, 115, 140,……
If this pattern continues, the number that will come next is

The correct answer is: 125

Step by step solution:
120 – 15 = 105
105 + 25 = 130
130 – 15 = 115
115 + 25 = 140
140 – 15 = 125
Thus, the number following the series will be 125.
Hence, option(a) is the correct option.