(37целых 1/5-6/8):8 помогите

(37 1/5-6/8):8= 4 69/160
1) 37 1/5 - 6/8= 37 8/40- 30/40=36 18/40=36 9/20
2) 36 9/20:8= 729/160=4 69/160