Kim takes 4 classes in school that last 2 hours each.  She drops 1 class.  How many hours of classes does she have now have per day?
How many classes does Kim have now? ** She is now in 4-1=<<4-1=3>>3 classes
How many hours does Kim spend in school? ** So she spends 3*2=<<3*2=6>>6 hours in school
#### 6