3целых 1/8+7целых 5/12+5целых 3/8+1/12
3 1/8+7 5/12+5 3/8+1/12= 1) 3 1/8+5 3/8=8 4/8= 8 1/2 2) 7 5/12+1/12=7 6/12=7 1/2 3) 8 1/2+7 1/2=15 2/2=16