2/5 +3/5 ,1/7+2/7+1/4, 3/4+2/4+14

2/5 + 3/5 = 5/5 = 1  1/7 + 2/7 + 1/4 = 4/28 + 8/28 + 7/28 = 19/28  3/4 + 2/4 + 14 = 14 + 5/4 = 15 1/4