1 / 3 plus 3 / 4, 15 / 11 minus 8 / 3, 14 / 5 plus 7 / 3, 7 / 6 minus 42 / 13, 7 / 4 plus 21 / 2 fast, urgent

1 / 3 plus 3 / 4, 15 / 11 minus 8 / 3, 14 / 5 plus 7 / 3, 7 / 6 minus 42 / 13, 7 / 4 plus 21 / 2 fast, urgent

1 / 3 plus 3 / 4 = 4 / 12 + 9 / 12 = 13 / 12 = 1 and 1 / 12
.
11 out of 15 minus 3 out of 8 = 88 out of 120 - 45 out of 120 = 43 out of 120
.
5 of 14 plus 3 of 7 = 5 of 14 + 6 of 14 = 11 of 14
.
6 out of 7 minus 13 out of 42 = 36 out of 42 - 13 out of 42 = 23 out of 42
.
4 out of 7 plus 2 out of 21 = 12 out of 21 + 2 out of 21 = 14 out of 21 = 2 out of 3