Hello again, and thank you for asking your questions here on brainly.
Short answer: 1:2
Why?
To find this out, we must simplify 15:24. 15:24 can be simplified to 5/8. So, which is 5/8 larger than? (5/8 < 19/24) ~~ (5/8 < 7/8) ~~ (5/8 < 6/8) ~~ (5/8 > 1/2)
5/8 > 1/2
Hope this helped you! ♥