Question

Jimmy's Chocolate shop sells two different fudge bars. The dark chocolate fudge bar sells for $6.00 per pound and the milk chocolate fudge bar sells for $4.00 per pound. You purchased a combination of these bars for all of your family and friends for the holidays and your bill came to $120. This scenario can be modeled by the equation 6d + 4m = 120. Which of the following is not a possible combination of dark chocolate bars and milk chocolate bars

Answer 1

10 dark bars and 15 milk bars
12 dark bars and 12 milk bars
14 dark bars and 18 milk bars
6 dark bars and 21 milk bars
dont get it but these are the answers