A third of the contestants at a singing competition are female, and the rest are male. If there are 18 contestants in total, how many of them are male?
There are 18/3 = 
<gadget id="calculator">18/3</gadget>
<output>6</output>
6 female contestants.
There are 18-6 = 
<gadget id="calculator">18-6</gadget>
<output>12</output>
12 male contestants.

<result>12</result>