3/5:9/30

Interpret as a ratio: (3/5) : (9/30)

• Simplify the second fraction: 9/30 = 3/10
• So it’s (3/5) : (3/10)
• Compute the ratio: (3/5) / (3/10) = (3/5) * (10/3) = 2
• Therefore the ratio is 2:1 (equivalently, 2).