Multiple choice general knowledge math & puzzles A natural number gets doubled when added to its reciprocal. Find that number! 2 1 0 ½ Reveal answer Fill a bubble to check yourself B Correct answer Explanation Let the number be x. Condition: x + 1/x = 2x. Solving: 1/x = x, so x^2 = 1, giving x = 1 (natural number). Check: 1 + 1/1 = 2, which equals 2 × 1 = 2. ✓ Option B is correct.