Question 1209191
A, Amy
V, Vicky


{{{system(A=V-24,and,V=5A)}}}


Substituting for A, into second equation
{{{V=5(V-24)}}}

{{{V=5V-120}}}

{{{120=4V}}}

{{{4V=3*4*10}}}

{{{highlight(V=30)}}}
and you can use that to find Amy's age.