- 1 month is equal to 27-31 days
- A complete revolution / orbit of the moon around the earth takes 1 / one month
- So, a complete revolution of the moon around the earth takes around 27 to 31 days

Hence, a complete revolution of the moon around the earth takes around 27 to 31 days
[Question]About how many Earth days does it take the Moon to travel around Earth?
[Context]- 1 month is equal to 27-31 days 
- A complete revolution / orbit of the moon around the earth takes 1 / one month