tolong dijawab 13 sampai 16!!

13) 4/5 + 7/4 = 51/20 = 2 11/20
14) 1 3/4 + 2 3/5 = 3 37/20 = 4 17/20
15) 5 1/2 + 2 2/8 = 7 6/8 = 7 3/4
16) 15 1/4 + 16 1/2 = 31 3/4