A numerical analogy — Aptitude Question
A numerical analogy: 9 : 81 :: 12 : ? Answer and worked solution on CodeKairo.
- Topic: Analogies & Classification
- Section: Logical Reasoning
- Difficulty: Easy
- Time target: 30 seconds
Question
9 : 81 :: 12 : ?
Options
- 120
- 132
- 144
- 156
Show the answer and the worked solution
Correct answer: C. 144
Worked solution
- 81 = 9².
- 12² = 144.
Answer: 144.
The idea
Test the simple operations in order: square, cube, double, add a constant, multiply. Confirm on the given pair before applying.
Shortcut. Only one option ends in 4, the units digit of 12²: 144.
Common trap. 132 — 12 × 11, a product of neighbours that looks square-like; 81 is 9 × 9, so the partner is 12 × 12.
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