Question

Write a system of equations and solve

Answer 1

$c+b=7$
$5c+45b=195$

$c+b=7$ --> $c=7-b$
$5c+45b=195$

$5(7-b)+45b=195$
$35-5b+45b=195$
$35+40b=195$
$40b=160$
$b=4$

$c+(4)=7$
$c=3$

$cars:3 \\ buses:4$