Civil Service Exam Reviewer · Logical Reasoning · hard
In each row, the third number is obtained from the first two by the same rule. Find the missing number. Row 1: 7, 3, 20 Row 2: 12, 11, 46 Row 3: 11, 4, ?
- 137
- 30
- 105
- 225
Answer
B. 30
Solution
Third number = (a + b) × 2 (with a = first number, b = second number). Row 1: 7, 3 → 20; Row 2: 12, 11 → 46. Row 3: 11, 4 → 30.
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