1. 4 : 9 = 6 : 18
4 / 9 = 6 / 18
4 / 9 = 1 / 3
NO
2. 9 : 15 = 24 : 40
9 / 15 = 24 / 40
3 / 5 = 6 / 10
3 / 5 = 3 / 5
YES
3. 28 : 21 = 8 : 6
28 / 21 = 8 / 6
4 / 3 = 4 / 3
YES
4. 28 : 8 = 35 : 10
28 / 8 = 35 / 10
14 / 4 = 7 / 2
7 / 2 = 7 / 2
YES
5. 6 : 16 = 48 : 18
6 / 16 = 48 / 18
3 / 8 = 24 / 9
3 / 8 = 8 / 3
NO
6. 8 :20 = 18 : 40
8 / 20 = 18 / 40
4 / 10 = 9 / 20
2 / 5 = 9 / 20
NO