Select the number that can replace the question mark (?) in the following series.
65, 70, 80, 95, 115, ?, 170
65 + 5 = 70
70 + 10 = 80
80 + 15 = 95
95 + 20 = 115
A number in the series is obtained by adding the previous number in the series with respective multiple of 5 as shown above.
$$\therefore\ $$Next number in the series = 115 + 25 = 140
Hence, the correct answer is Option C
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