First you have to get a common denominator, so multiply each fraction by the opposite fraction's denominator, but the whole number is not multiplied along with it.
3 1/3 5 = 3 3/15
2 2/5 3 = 2 6/15
Now you can subtract them
3 3/15 - 2 6/15
48/15 - 36/15
12/15
4/5 is the answer!
I hope that helps!
