Priya's evening dance class ends at 21:15. She left home 30 minutes before the class ended. What time did Priya leave home? Give your answer in 12-hour notation.
Show Worked Solution
Worked Solution
Step 1: Subtract 30 minutes from the class end time.
21:15 − 30 minutes:
15 − 30 is negative, so borrow 1 hour: (60 + 15) − 30 = 45 minutes
Hours: 21 − 1 = 20
Result: 20:45
Step 2: Convert 20:45 to 12-hour notation.
20 − 12 = 8, and since 20:00 is in the evening, it is p.m.
20:45 = 8:45 p.m.
Answer: Priya left home at 8:45 p.m.
Correct answer: 8:45 p.m.
Want more questions like this? Superholic Lab has 10,000+ MOE-aligned questions with full worked solutions.
Start Free Trial — 7 Days Free