Junior's coffee shop offers two different sizes of coffee. The small coffee costs $2.50 while the large coffee costs $3.50. It is your turn to buy coffee for the office and your bill came to $52.50. This scenario can be modeled by the equation 2.5x + 3.5y = 52.50 where "x" represents the number of small coffees and "y" represents the number of large coffees. Which of the following is not a possible combination of small and large coffees?

Question

nurali · Answer

this adds up to 2.5*15 + 3.5*0 = $37.50
all the others add up to $52.50
so the answer is 15 small coffees and 0 large coffees