What should come at the place of question mark? 120, 99, 80, 63, 48, ?
35
Look at the differences between consecutive terms: 120 − 99 = 21, 99 − 80 = 19, 80 − 63 = 17, and 63 − 48 = 15.
These differences form their own decreasing sequence: 21, 19, 17, 15, each dropping by 2 from the previous one.
Following this pattern, the next difference should be 15 − 2 = 13, so the next term is 48 − 13 = 35.
Hence, the answer is 35.
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