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A books thickness in 31 millimeters what is the thickness in centimeters

User Filbert
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\bf \begin{array}{ccllll} cm&mm\\ \textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\ 1&10\\ x&31 \end{array}\implies \cfrac{1}{x}=\cfrac{10}{31}

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User Yashaswi N P
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