In 2021, Wayne is 37 years old.  His brother Peter is 3 years older than him and their sister Julia is 2 years older than Peter.  What year was Julia born in?
Peter is 3 years older than Wayne who is 37 so Peter is 37+3 = 
<gadget id="calculator">37+3</gadget>
<output>40</output>
40 years old.
Julia is 2 years older than Peter who is 40 so Julia is 2+40 = 
<gadget id="calculator">2+40</gadget>
<output>42</output>
42 years old.
It's 2021 and Julia is 42 years old so she was born in 2021-42 = 
<gadget id="calculator">2021-42</gadget>
<output>1_979</output>
1979.

<result>1_979</result>