Put YES if the given is proportion and NO if it is not. (Hint: Reduce to lowest term)

_____1. 20:50 = 10:25

_____2. 13:26 = 2:4

_____3. 12:18 = 54:81

_____4. 14:15 = 24:25

_____5. 6:8 = 27:30

_____6. 3/9 = 4/18

_____7. 3/6 = 5/10

_____8. 9/18 = 1/12

_____9. 40/90 = 12/27

_____10. 250/1000 = 9/36