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