If yellow is 15, then we set 2/5 = x/15, letting x = green. 5x = 30, so x = 6. Again, with yellow being 15, then we set 3/4 = 15/x, letting x = orange. 3x = 60, so x = 20. Then, the ratio of green to orange is 6:20 = 3:10. Hope this helps!
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