it won 5 and there were 7 races so 7-5 = 2 which means he lost 2 races so the win-lose ratio is 5:2 or 5/2

so if it won 5 out of 7 races is ran then you could ethier put 5:7 to say it won 5 out of the 7 or you could put 2:7 to say it lost 2 out of the 7.