Multiple choice

Find the missing number (?) in the given series. $17.5 \quad 31 \quad 58 \quad 98.5 \quad 152.5 \quad ?$

  1. 169.5

  2. 180.5

  3. 220

  4. 205

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Find differences: 31 - 17.5 = 13.5, 58 - 31 = 27, 98.5 - 58 = 40.5, 152.5 - 98.5 = 54. Each difference increases by half the previous difference. Next difference = 54 + 27 = 81. So 152.5 + 81 = 233.5. Wait, let me verify: pattern is +13.5, +27, +40.5, +54 (each increases by 13.5). Next is +67.5, giving 152.5 + 67.5 = 220.

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