Adam goes to a small school, which teaches 80 students in three classes. 40% of the students are in class A, and class B has 21 students fewer than class A. The rest are in class C. How many students are in this class?
In class A, there are 40/100 * 80 = 
<gadget id="calculator">40/100*80</gadget>
<output>32</output>
32 students.
In class B, the number of students is less by 21, which means class B has 32 - 21 = 
<gadget id="calculator">32-21</gadget>
<output>11</output>
11 students.
That means 80 - 32 - 11 = 
<gadget id="calculator">80-32-11</gadget>
<output>37</output>
37 students are in class C.

<result>37</result>