Multiple choice general knowledge math & puzzles

A positive integer is equal to 4 times its reciprocal. Find that number!

  1. -4

  2. 2

  3. 3

  4. 9
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let the number be $x$. The equation is $x = 4(1/x)$, which simplifies to $x^2 = 4$. Solving for a positive integer gives $x = 2$. The value -2 is excluded because the question specifies a positive integer.

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