273 150:45

I’m not sure what you want to do with "273 150:45". Could you share the exact task? Here are a few likely interpretations with quick results:

• If 150:45 is a ratio to simplify: gcd(150,45) = 15, so 150:45 = 10:3.
• If 150:45 is a time (mm:ss): that’s 150 minutes and 45 seconds, i.e., 2 hours 30 minutes 45 seconds (02:30:45).
• If you’re forming a proportion with 273, e.g., 273/x = 150/45: then x = 273 × 45 / 150 = 81.9.
• If you meant something else (e.g., combine as 273 and 150:45, convert to seconds, etc.), please share the exact problem statement.

Which interpretation matches your exam question, or paste the full problem? I can walk you through the solution.