Marcus is half of Leo’s age and five years younger than Deanna. Deanna is 26. How old is Leo?
Marcus is 26 - 5 = 
<gadget id="calculator">26-5</gadget>
<output>21</output>
21 years old.
Thus, Leo is 21 * 2 = 
<gadget id="calculator">21*2</gadget>
<output>42</output>
42 years old.

<result>42</result>