Question 1165652
Mark, m
Juan, n
Jermin,r
Carol, c
-

{{{system(m=n+2,r=2m,c=2r,m+n+r+c=38)}}}


sub for m:

{{{system(m=n+2,r=2n+4,c=2r)}}}


sub for r:

{{{system(m=n+2,r=2n+4,c=4n+8)}}}


Sub into the sum equation:

{{{(n+2)+n+(2n+4)+(4n+8)=38}}}
.
.
{{{highlight(n=3)}}}--------Juan's age found.




Other substitutions,...
result in
{{{system(m=5,r=10,c=20)}}}{{{system(Mark,Jerman,Carol)}}}