Eduardo is a teacher. He taught 3 classes last week while his colleague Frankie taught double what Eduardo teaches. How many classes did Eduardo and Frankie teach in total?
Frankie taught 3 * 2 = 
<gadget id="calculator">3*2</gadget>
<output>6</output>
6 classes.
Combined, Frankie and Eduardo taught 3 + 6 = 
<gadget id="calculator">3+6</gadget>
<output>9</output>
9 classes.

<result>9</result>