Respuesta :

If y and x varies directly we can use a rule of 3 to find the missing x so:

[tex]\begin{gathered} 3\to21 \\ x\to105 \end{gathered}[/tex]

and the equation will be:

[tex]\begin{gathered} x=\frac{3\cdot105}{21} \\ x=15 \end{gathered}[/tex]

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