Verified answer

11/12 + 11/20 = 55/60 + 33/60=88/60;

88/60 + 1целая 7/8=22/15 + 1 целая 7/8= 1целая 7/15 + 1 целая 7/8 = 1целая 56/120+1целая105/120=2целых161/120=3целых41/120