Multiple choice general knowledge math & puzzles A natural number is doubled when added to its reciprocal. Find thatnumber! 1/2 2 1 0 Reveal answer Fill a bubble to check yourself C Correct answer Explanation Let the number be $x$. The equation is $2x = x + 1/x$. Subtracting $x$ from both sides gives $x = 1/x$, which means $x^2 = 1$. Since it is a natural number, $x = 1$.