5:5

If you’re simplifying the ratio 5:5, it reduces to 1:1 (divide both terms by gcd(5,5) = 5).

Other quick notes:

• As a decimal ratio: 1.0
• If you think in percentages of the total 10 units: each part is 5/10 = 50% of the total.

If you meant something else (e.g., a proportion, probability, or an equation like 5x = 5y), tell me the context and I’ll tailor it.