Question 30

Select the number that can replace the question mark (?) in the following series.
65, 70, 80, 95, 115, ?, 170

Solution

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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Select the number that can replace the question mark (?) in the following series.65, 70, 80, 95, 115, ?, 170