I do not know what kind of answer you may want but here is a few you might be asking for
(1). Every 12 games Alice wins 8 games and looses 4. ( 8/12 )
(2). Alice wins 2/3 games against a computer. ( 8/12 )
(3). Alice wins 66% of games she plays against a computer.
There you go.
The theorem should be same side interior
15/30=2/4
you divide 15 by 7.5=2, and 30 by 7.2 which equals 4
The answer to the question is