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

Correct Answer: b) 35

Explanation:
Look for a consistent relation among the three numbers in each group.

Check the first and third groups:
– 28, 20, 7 → 28 × 5 = 140 and 20 × 7 = 140
– 45, 25, 9 → 45 × 5 = 225 and 25 × 9 = 225

So the pattern is: first × 5 = middle × third.

Apply it to the second group:
– 84, ?, 12 → 84 × 5 = ? × 12
– 420 = 12 × ?
– ? = 420 ÷ 12 = 35

Therefore, the missing number is 35.