Answer :

[tex] \frac{3}{4}= \frac{n}{32} [/tex] ⇒ [tex] \frac{3\cdot8}{4\cdot8}= \frac{n}{32} [/tex] 

[tex] \frac{24}{32}= \frac{n}{32} | *32 [/tex] ⇒ [tex]\boxed {n=24}[/tex]