It is: 18 to 12
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Oh, dude, the ratio of 45 to 30 is 3:2. It's like saying for every 3 parts of 45, you've got 2 parts of 30. So, if you're ever at a party and someone asks for the ratio of 45 to 30, you can impress them with your math skills.
2:3 or 2 to every 3
20:30 is one example.
-3/5
30 minutes is 1/6th of 3 hours, so the ratio of 30 minutes to 3 hours is 1:6