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Finding Significant Figures

If 42x is d...

Question

If $42 x$ is divisible by $9$ , find the value of digit $x$ .

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Solution

$\begin{matrix} \frac{42 x}{9} = \frac{14 x}{3} f o r i n t e g e r r e s u l t x s h o u l d b e m u l t i p l e o f 3 s o x = 3 \end{matrix}$

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