(3 1/9 : 3 4/9 + 3/31):1/4-3*2/7

Question

(3 1/9 : 3 4/9 + 3/31):1/4-3*2/7

Answer 1

1) 3 1/9:3 4/9=28/31
2) 28/31+3/31=1.
3) 1:1/4=4
4) 3*2/7=6/7
5) 4:6/7=4 2/3