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State PCS PYQPrelims 2025

BPSC – Combined Competitive Examination · Question 9

Find the missing number from the given alternatives: 28 20 7 84 ? 12 45 25 9

  1. 30
  2. 35
  3. 20
  4. 25
Show answer & explanation

Answer: (B) 35

Explanation

In each row, first number × 5 = second × third (28×5 = 20×7 = 140; 45×5 = 25×9 = 225). So ? = 84×5 ÷ 12 = 35.

  • (A) Incorrect

    Wrong: 30 × 12 = 360, but 84 × 5 = 420.

  • (B) Correct

    Correct: pattern: first × 5 = middle × third; 84 × 5 = 420 = 35 × 12.

  • (C) Incorrect

    Wrong: 20 × 12 = 240, not 420.

  • (D) Incorrect

    Wrong: 25 × 12 = 300, not 420.