Question 1021872
{{{J=27+I}}}
20 years ago,
{{{J-20=4(I-20)}}}
{{{J-20=4I-80}}}
{{{J=4I-60}}}
Substituting,
{{{27+I=4I-60}}}
{{{-3I=-87}}}
{{{I=29}}}
So,
{{{J=27+29}}}
{{{J=56}}}