1:1,2

Interpretation: 1:1,2 means the ratio 1 to 1.2 (decimal comma as decimal separator).

Steps:

• 1.2 = 6/5
• So 1 : 1.2 = 1 : (6/5) = 5/5 : 6/5 = 5 : 6

Answer: 5:6

If you meant something else (e.g., a different notation), please clarify.