okay so first make them into an improper fraction
3 1/3 = 10/3 2 1/5 = 11/5
next find a common denominator which would be 15
so 10 times 5 is 50 and 3 times 5 is 15 so 50/15
11 times 3 is 33 and 5 times 3 is 15 so 33/15 next subtract the numerators.
50/15 - 33/15 = 17/15
finally simplify it so your answer would be 1 2/15
