To add the fractions 7/15 and 1/3, we need to find a common denominator. The least common multiple of 15 and 3 is 15.

Therefore, 7/15 + 1/3 would be equivalent to (7/15) + (5/15) = 12/15 = 4/5.

To subtract the fractions 43/62 and 10/31, we also need to find a common denominator. The least common multiple of 62 and 31 is 62.

Therefore, 43/62 - 10/31 would be equivalent to (43/62) - (20/62) = 23/62.