Digimon had its 20th anniversary.  When it came out John was twice as old as Jim.  If John is 28 now how old is Jim?
When Digimon came out John would have been 28-20=
<gadget id="calculator">28-20</gadget>
<output>8</output>
8.
So Jim was 8/2=
<gadget id="calculator">8/2</gadget>
<output>4</output>
4 years old.
That means John is now 4+20=
<gadget id="calculator">4+20</gadget>
<output>24</output>
24.

<result>24</result>