A family of 2 adults and 3 children went out to dinner. the total bill was $42. each child's dinner cost $4. how much did each adult's dinner cost?
Each child's dinner - $4
3 child's dinner - $4 x 3 = $12
$42 - 12 = $30
$30 divided by 2 = $15
How much each adult's dinner cost is $15.