Marnie and Judy hit a total of 12 home runs this season. Judy hit 6 more than Marnie. How many home runs did Judy hit?

So the formula for that is:

(total - difference) : 2 = smaller number

(total + difference) : 2 = larger number

In this case, Judy is more so we do second fomula:

(12 + 6) : 2 = 9 hits homerun

and Marnie will hit 12 - 9 = 3 hits