Respuesta :
18:9 is the same as 9 times 2 = 18
4:2 is the same as 2 times 2=4
22:11 is the same as 11 times 2=22
So the common number there is 2 meaning two is your answer
4:2 is the same as 2 times 2=4
22:11 is the same as 11 times 2=22
So the common number there is 2 meaning two is your answer