How many minutes are left till six O' clock if it was 45 minutes past four O' clock fifty minutes ago ?

Correct option is A

1. Time 50 minutes ago:

   • It was 4:45 fifty minutes ago.

2. Current time:

   • Add $50$ minutes to $4:45$:
     $4:45+50\text{minutes}=5:35$.

3. Minutes left till 6:00:

   • From $5:35$, calculate the time remaining to reach $6:00$:
     $6:00-5:35=25\text{minutes}$.

Final Answer:

25 minutes are left till six O'clock