Question 741242
The problem only talks about cleaning 120
rooms, so that can be called 1 job
So, I can say:
6 cleaners do 1 job in 4 hrs
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1/3 the number of cleaners will take 3 times as long
to do the job, so
2 cleaners can do 1 job in 12 hrs
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4 times that number of cleaners will take 1/4 that time
to do 1 job, so
8 cleaners can clean 120 rooms ( 1 job ) in 3 hrs