Answer:11/15
Explanation:
you have to change them to common denominators.
i chose 15.
to make the denominator for 1/3 into 15 you have to multiply it by 5 which means you have to multiply the numerator (1) by the same thing which gives you 5/15
to make the denominator for 2/5 into 15 you have to multiply the denominator by 3 so you have to multiply the numerator (2) by the same thing which gives you 6/15
you now have the equation 5/15 + 6/15
to add them together you leave the bottom numbers the same and add the top ones which gives you 11/15