John had a son James when he was 19.  James is now twice as old as his sister Dora, who will turn 12 in 3 years.  How old will John's youngest son, who was born when John was 32, be in 3 years?
Dora is 12-3=
<gadget id="calculator">12-3</gadget>
<output>9</output>
9.
So James is 9*2=
<gadget id="calculator">9*2</gadget>
<output>18</output>
18 years old.
That means John is 18+19=
<gadget id="calculator">18+19</gadget>
<output>37</output>
37.
Johns youngest son is 37-32=
<gadget id="calculator">37-32</gadget>
<output>5</output>
5 years old.
So he will be 5+3=
<gadget id="calculator">5+3</gadget>
<output>8</output>
8 in 3 years.

<result>8</result>