1/5 + 8/25 + 7/25 = 1/5 + (8 + 7)/25 = 1/5 + 15/25 = 1/5 + 3/5 = 4/5
1/7 + 2/21 + 3/7 = 1/7 + (2 + 9)/21 = 1/7 + 11/21 = 1/7 + 4/7 = 5/7
1/15 + 2/45 + 7/15 = 1/15 + (2 + 21)/45 = 1/15 + 23/45 = 1/15 + 1/3 = 6/15 = 2/5
3/49 + 5/7 + 4/49 = (3 + 4)/49 + 5/7 = 7/49 + 35/49 = 42/49 = 6/7
7/10 + 2/15 + 11/30 = 7/10 + 4/15 + 11/30 = 21/30 + 8/15 + 11/30 = 11/10 = 1 1/10
1/12 + 1/18 + 1/12 = 1/12 + 1/18 + 2/24 = 2/24 + 1/18 + 2/24 = 5/24 + 1/18 = 5/24 + 4/24 = 9/24 = 3/8
1/5 + 8/25 + 7/25 = 1/5 + (8 + 7)/25 = 1/5 + 15/25 = 1/5 + 3/5 = 4/5
1/7 + 2/21 + 3/7 = 1/7 + (2 + 9)/21 = 1/7 + 11/21 = 1/7 + 4/7 = 5/7
1/15 + 2/45 + 7/15 = 1/15 + (2 + 21)/45 = 1/15 + 23/45 = 1/15 + 1/3 = 6/15 = 2/5
3/49 + 5/7 + 4/49 = (3 + 4)/49 + 5/7 = 7/49 + 35/49 = 42/49 = 6/7
7/10 + 2/15 + 11/30 = 7/10 + 4/15 + 11/30 = 21/30 + 8/15 + 11/30 = 11/10 = 1 1/10
1/12 + 1/18 + 1/12 = 1/12 + 1/18 + 2/24 = 2/24 + 1/18 + 2/24 = 5/24 + 1/18 = 5/24 + 4/24 = 9/24 = 3/8