Hi there!
Since the denominators are the same in both fractions, this makes solving the problem super easy! All we need to do is to add the numbers across the fractions (numerator + numerator). We do not add the denominators together because they are the same.
WORK:
3/10 + 6/10 = 9/10
ANSWER:
Ross and Brady ate 9/10 of the pie together.
Hope this helps!! :)
If there's anything else that I can help you with, please let me know!