A customer at a copy shop has $6.00 remaining on a prepaid card. Black-and-white copies cost $0.12 each, and color copies cost $0.20 each. The equation [math]12x + 20y = 600[/math] models this situation, where [math]x[/math] is the number of black-and-white copies and [math]y[/math] is the number of color copies the customer can make by using the card. What is the maximum number of color copies the customer can make?
