Answer:
3:2
Explanation:
To answer questions like this I would makeup an age for Alan
Like say Alan is 10 years old
John is 3 times the age of 10 so he is 30
Ralph is twice the age of 10 so he is 20
so 30/20 can be simplified to 3/2
There are other ways to solve it but that is how I would solve it
I hope it helped you