Unknown number 4

I think number. When I divided its square root by its 1/9, I get a number 1. What number am I thinking?

Correct answer:

x =  81

Step-by-step explanation:

$$\begin{gathered} \sqrt{x}\mathrm{/}(x\mathrm{/}9)=1 \\ \sqrt{x}=9 \\ x=9^2=81 \end{gathered}$$

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