Answer:
1 and 7/30 minutes
Step-by-step explanation:
You know that the 3 commercials add up to 3 minutes of time. And that the first two are 1 1/6 minute and 3/5 minute. To add them you need a common denominator.
- 1 1/6=7/6. 7/6*5/5=35/30.
- 3/5*6/6=18/30.
- 35/30+18/30=53/30. 53/30 simplifies to 1 23/30 (don't need to simplify yet).
- Now, you need to subract that from 3. To write it over 30, multiply by 30/30. 3/1*30/30=90/30.
- 90/30-53/30=37/30. 37/30 can be written as 1 7/30.
