8/18-8/27= 24-16/54=8/54=4/27
7/16-5/24=21-10/48=11/48
2/11-1/12=24-11/132= 13/132
12/13-15/26= 24-15/26=9/26
9/28-11/35=315-308/980=7/980=1/140
39/40-19/28=1092-760/1120= 332/1120=83/280
25/28-18/35= 875-504/980= 371/980=53/140
40/63-35/72= 320-245/504=75/504=25/168
22/21-21/22=484-441/462= 43/462