Geb is 10 less than half the age of Haley. If Haley is 26 years old, how old is Geb?
Half of Haley's age is 26/2 = 
<gadget id="calculator">26/2</gadget>
<output>13</output>
13.
So Geb is 13 - 10 = 
<gadget id="calculator">13-10</gadget>
<output>3</output>
3 years old.

<result>3</result>