On the island of Castor, there are 40 chess players. A quarter of the island's chess players have never lost to an AI. How many people on the island have lost to a computer, at least once?
Chess players that have never lost to an AI is 40/4 = 
<gadget id="calculator">40/4</gadget>
<output>10</output>
10 people.
Chess players that have lost to an AI is 40-10 = 
<gadget id="calculator">40-10</gadget>
<output>30</output>
30 people.

<result>30</result>