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?
She is now in 4-1=
<gadget id="calculator">4-1</gadget>
<output>3</output>
3 classes.
So she spends 3*2=
<gadget id="calculator">3*2</gadget>
<output>6</output>
6 hours in school.

<result>6</result>