Complete the series: 90, 85, 75, 55, _____?
- 20
- 25
- 15
- None of these
Explanation
Let’s analyze the pattern:90 → 85 (−5)
85 → 75 (−10)
75 → 55 (−20)
The subtraction pattern is: −5, −10, −20 … each time doubling.
Next should be: −40
So,
55 − 40 = 15
Last verified on 14-11-2026
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