Square roots — Analogies & Classification Aptitude Question
Square roots: 16 : 4 :: 49 : ? Answer and worked solution on CodeKairo.
- Topic: Analogies & Classification
- Section: Logical Reasoning
- Difficulty: Easy
- Time target: 30 seconds
Question
16 : 4 :: 49 : ?
Options
- 6
- 7
- 8
- 9
Show the answer and the worked solution
Correct answer: B. 7
Worked solution
- 4 = √16.
- √49 = 7.
Answer: 7.
The idea
The relation may run either way — squaring or taking the root. The order of the pair tells you which.
Shortcut. 4 × 4 = 16, so the pair is number → square root; 7 × 7 = 49, and no other option squares to 49.
Common trap. 8 — the root of 64, the square next to 49; a candidate unsure of 7² who guesses from size can land on it.
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