Question 1206462
{{{system(v=15j,v+4=(j+4)^2)}}}


{{{15j+4=(j+4)^2}}}

{{{15j+4=j^2+8j+16}}}

{{{j^2-7j+12=0}}}

{{{(j-3)(j-4)=0}}}


{{{j=3}}}------?

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If {{{j=3}}}, then {{{v=45}}}


{{{j=4}}}------?

If {{{highlight(j=4)}}} then {{{highlight(v=60)}}}.
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<s>Can those both work?</s>
<s>45+4=(3+4)^2</s>
<s>49=49</s>
{{{cross(ok)}}}
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60+4=(4+4)^2
64=8^2
64=64


<s>Both seem to work.</s>


You can look for the asked-for difference in ages.