The caterer at a brunch bought several pounds of chicken salad and several pounds of tuna salad. the chicken salad cost $9 per pound, and the tuna salad cost $6 per pound. he bought a total of 14 pounds of salad and paid a total of $111. how much chicken salad did he

a) 6 pounds
b) 7 pounds
c) 8 pounds
d) 9 pounds