1+10
2+9
3+8
4+7
5+6
............................................./.................................................
<span>(4243- 3283) / 32 = 960 / 32 = 30</span>
5/16 3/4=16
2/3 7/18 =18
11/12 23/60=60
4/5 1/6=30
8/9 2/7=63
7/8 6/11 =88
4/15 5 /12=60
11/12 17/18 =216
23/30 2/45=90
3/56 7/ 126=21168
15/52 13/78=4056
29/180 35/216 =38880