For the first given just solve them using the cross multiplication method and divide 8 in both sides. You may also use this solving for the second and third given.
[tex]1. \begin{gathered} \frac{4}{8} = \frac{n}{7} \\ 8n = (4)(7) \\ 8n = 28 \\ \frac{ \cancel{8}n}{ \cancel{8}} = \frac{28}{8} \\ \sf \bold{n = 3.5}\end{gathered}[/tex]
[tex]2. \begin{gathered} \frac{7}{n} = \frac{5}{2.5} \\ 5n = (7)(2.5) \\ 5n = 17.5 \\ \frac{ \cancel{5}n}{ \cancel{5}} = \frac{17.5}{5} \\ \sf \bold{n = 3.5}\end{gathered}[/tex]
[tex]3. \begin{gathered} \frac{3}{3.6} = \frac{4}{n} \\ 3n = (3.6)(4) \\ 3n = 14.4 \\ \frac{ \cancel{3}n}{ \cancel{3}} = \frac{14.4}{3} \\ \sf \bold{n = 4.8}\end{gathered}[/tex]
if there's a Latex Error, Please click the image attached below :)
Goodluck! :D
