Question

s+t=72; s=t+54; t=?; s=?

Answer 1

$s+t=72 \\ s=t+54 \\ t+54+t=72 \\ 2t+54=72 \\ 2t=72-54 \\ 2t=18 \\ t=\frac{18}{2} \\ \boxed{\bold{t=9}} \\ s=t+54 \\ s=9+54 \\ \boxed{\bold{s=63}}$