1. The sum of a non-zero number and twenty times its reciprocal is 9. What is the number?
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By: anil on 05 May 2019 01.45 am
$$ x + 20(frac{1}{x}) = 9$$ $$Rightarrow (x^{2}+20) = 9 imes x$$ $$Rightarrow x^{2}-9x+20 = 0$$ $$Rightarrow(x-4)(x-5)=0$$ $$Rightarrow x = 4 or 5$$ so the answer is option D.
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