Answer:
Emille's soccer team
Step-by-step explanation:
You want to know the higher win/loss ratio of Emille's 9/12 or Grant's 10/15.
One way to compare the fractions is to subtract one from the other:
9/12 -10/15 = (9·15 -12·10)/(12·15) = (135 -120)/(12·15) = 1/12
This is a positive number, so the fraction 9/12 is higher.
Emille's team's win/loss ratio is higher because subtracting the win/loss ratio of Grant's team gives a positive result.
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Additional comment
Grant's team's ratio reduces to 2/3, which can be expressed as 8/12. This is clearly lower than 9/12.