Answer :
The value of c is 5
Explanation:[tex]\begin{gathered} \text{Given:} \\ \frac{3}{4}\text{ = }\frac{7.5}{2c} \end{gathered}[/tex]To solve for c, we will cross multiply:
[tex]\begin{gathered} 3(2c)\text{ = 4(7.5)} \\ 6c\text{ = 30} \end{gathered}[/tex]Divide both sides by 6:
[tex]\begin{gathered} \frac{6c}{6}\text{ = }\frac{30}{6} \\ c\text{ = 5} \end{gathered}[/tex]The value of c is 5