There is a lot of dust in Susie's house. It takes her 2 hours to vacuum the whole house. She can vacuum each room in 20 minutes. How many rooms does she have in her house?
Susie spends 2*60 = <<2*60=120>>120 minutes vacuuming.
Since she can vacuum each room in 20 minutes, she has 120/20 = <<120/20=6>>6 rooms in her house.
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