Orange = 30%.
Red = Orange ÷ 3 = 30% ÷ 3 = 10%.
Yellow = 100% − 30% − 10% = 60%.

• Ratio (O : R : Y) = 30 : 10 : 60
• Simplify: divide all by 10.
• = 3 : 1 : 6

Final Answer: 3 : 1 : 6