Answer :
hello
let's write out the individual equations
[tex]\begin{gathered} 15=0.75g \\ g=\text{ number of games} \end{gathered}[/tex][tex]\begin{gathered} 12=0.5g \\ g=\text{ number of games} \end{gathered}[/tex]let's equate both equations
[tex]15+0.75g=12+0.5g[/tex]this corresponds to option A