Question 1066759
t Teacher
x Younger student
y Older student


{{{system(y/x=3,t=5y,t+5=5(x+5))}}}

Several ways to go.  Note that the question is ,  find the teacher's age.


{{{x/y=1/3}}}
{{{x=y/3}}}
-
{{{t+5=5(y/3+5)}}}
{{{t+5=5y/3+25}}}
{{{t=5y/3+20}}}
-
{{{5y=5y/3+20}}}
{{{15y=5y+60}}}
{{{10y=60}}}
{{{highlight(y=6)}}}


Found y but again, question is to find t.
{{{t=5y}}}
{{{t=5*6}}}
{{{highlight(t=30)}}}
Teacher is 30 years old.