15/20 = 3/415 = 3520 = 45
8/10 = 4/58 = 4210 = 52
8/10 = 4/54/6 = 2/36/9 = 2/310/25 = 2/514/49 = 2/75/15 = 1/312/15 = 4/514/18 = 7/9
20/28 ≠ 30/3620 = 4528 = 4730 = 6536 = 66So, 20/28 = 5/7 and 30/36 = 5/6, which are not equal.
15/20 = 3/4
15 = 35
20 = 45
8/10 = 4/5
8 = 42
10 = 52
8/10 = 4/5
4/6 = 2/3
6/9 = 2/3
10/25 = 2/5
14/49 = 2/7
5/15 = 1/3
12/15 = 4/5
14/18 = 7/9
20/28 ≠ 30/36
20 = 45
28 = 47
30 = 65
36 = 66
So, 20/28 = 5/7 and 30/36 = 5/6, which are not equal.