Answer:
1. Transform the given ratio into fractional form.
[tex]\huge\sf{\frac{3}{n} = \frac{9}{30}}[/tex]
2. Multiply the means and extremes.
[tex]\sf{3 (30) = n (9)}[/tex]
[tex]\sf{90 = 9n}[/tex]
3. Simply divide it both sides by 9 to get the value of n.
[tex]\huge\sf{\frac{90}{9} = \frac{9n}{9}}[/tex]
4. Final answer, simplification.
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