Question 826579
j for jonny, and w for awa.


{{{j=3w}}}
and
  {{{(j-5)=5(w-5)}}}.


Before answering the question of when the sum of their ages be 80, first solve the system for j and w.  Once found those values, assign a different variable to use in representing their age at the later unknown time, and form their sum, and equate to 80; and then solve this equation for the new variable.  


Still need help?