7. Charlie and Dasha are roommates, and they have a dog. If neither of them is home, they hire someone to watch the dog. Charlie must go on business trips every 6 months, while Dasha must go on business trips every 9 months. If they both just got back from business trips, how many months will it be before they need to hire someone to look after the dog again? Explain your answer.
First find the least common multiple.In case you don't know what that is its basically the number they have in common when you skip count by 6 and 9.Your answer would be 18.So that's your answer.
