Question 819046
x = how many of white paint
y = how many of blue paint


Accounting for how many cans of paint, x+y=5 because given is 5 cans of paint.


Accounting for cost, 24x+28y=132.


You simply forgot to make use of the given 5 cans of paint.
Divide both sides of the cost equation by 4 before solving the system.