Step-by-step explanation:
[tex] \frac{3y}{5} = 15[/tex]
[tex]3y = 15 \times 5[/tex]
[tex]3y = 75[/tex]
[tex]y = \frac{75}{3} [/tex]
[tex] \sf{y = 25}[/tex]
Hope it helps.. :)