Brain and Zach went to village grille for lunch. Brian's lunch cost $4 less than 3 times Zach's. The total cost for lunch was $25.How much did each boy spend on lunch?
Let's say that Zach spent Z on his lunch.
Brain (Brian?) spent $4.00 lest than 3 times Zach: Brain spent 3·Z - 4.00.
Together, they spent $25.00: Z + (3Z - 4.00) = 25.00
4Z - 4.00 = 25.00
4Z = 29.00
Z = $7.25
3·Z - 4.00 ---> 3(7.25) - 4.00 = $17.75