In 5 years, Heath will be 3 times as old as Jude.  If Heath is 16 years old today, how old is Jude today?
In 5 years, Heath will be 16 + 5 = 
<gadget id="calculator">16+5</gadget>
<output>21</output>
21 years old.
In 5 years, Jude will be 21 / 3 = 
<gadget id="calculator">21/3</gadget>
<output>7</output>
7 years old.
The difference in their ages is 21 - 7 = 
<gadget id="calculator">21-7</gadget>
<output>14</output>
14 years.
Today, Jude will be 16 - 14 = 
<gadget id="calculator">16-14</gadget>
<output>2</output>
2 years old.

<result>2</result>