Question

Are the ratios 4:9 & 12:18 equivalent?

Answer 1

No since if you multiply 4 and 9 you end up with 8:18 which isn't equal to 12:18. This can also be solved by simplifying 12:18 to 6:9 which again isn't equal to 4:9.
-Hope this helps :)

Answer 2

No they aren't because they both can't be multiple by the same number