Question 1204000
p Pepito
c Chito


You could start this way:  {{{system(p-10=3(c-10),p+10=2(c+10))}}}.


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Find the ratio of their present ages
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{{{system(p-10=3c-30,p+10=2c+20)}}}

{{{system(p-3c=-20,p-2c=10)}}}

E2-E1:
{{{c=30}}}


Using E2:
{{{p=2c+10}}}
{{{p=2*30+10}}}
{{{p=70}}}


Ratio, {{{highlight(p/c=7/3)}}}.