Answer:
76 chess sets
Step-by-step explanation:
Since they bought 16 cases and each contains 18 sets, let's multiply them
16 x 18 = 288
There were already 16 sets before that so lets add those as well
288 + 16 = 304
Now since there are 4 teachers we divide this among them
304/4 = 76
76 is the answer.
