Question

1) 31/60 -(3/16 + 11/60)=?
2) 2/49 + (3/45 + 7/9)=
3) 25/28- 18/35=
4) 1/8 + 3/9 + 5/36=
5) 1/4 + 4/7 + 9/28=
6) 3/20 +7/30 + 2/40=
7) 11/18 - 5/12 - 1/9=
8) 4/15 + 2/5 + 1/6=