x/6 = 8/12
5/10 = 3/x
4/5 = 8/x
10/x = 5/6
10/12 = x/24
2/x = 10/35
x/15 =4/20
x/12 = 3/18
3/21= 20/x
6/30 = 7/x
x/40 = 9/24
4
20
6
3
10
2
7
35
12
140
15
