There are 9 boys and 12 girls in a class. The teacher needs to create groups with three members for their class activity. How many groups are formed?
There are 9 + 12 = 
<gadget id="calculator">9+12</gadget>
<output>21</output>
21 students in a class.
Hence, 21/3 = 
<gadget id="calculator">21/3</gadget>
<output>7</output>
7 groups are formed.

<result>7</result>