Ariel bought several bags of caramel candy and taffy. The number of bags of taffy was 15 more than the number of bags of caramels. Taffy bags weigh 11 ounces each, and caramel bags weigh 17 ounces each. The total weight of the bags of candy was 697 ounces.
Type the total number of bags of candy Ariel bought.
number of caramels --- x
number of taffy -------- t
t = c + 15
11t + 17c = 697
use substitution
11(c+15) + 17c = 697
solve for c
Once you have c, sub that into 11t+17c = 697 to find t.