Question 378073
I can answer (3)
Let {{{c}}} = cost for 1 child
Let {{{a}}} = cost for 1 adult
given:
(1) {{{3c + 2a = 120}}}
(2) {{{5c + a = 95}}}
Multiply both sides of (2) by {{{2}}}
and subtract (1) from (2)
(2) {{{10c + 2a = 190}}}
(1) {{{-3c - 2a = -120}}}
{{{7c = 70}}}
{{{c = 10}}}
And, from (2),
(2) {{{5*10 + a = 95}}}
{{{a = 95 - 50}}}
{{{a = 45}}}
$10 = cost for 1 child
$45 = cost for 1 adult