Answer: 45 foot long hotdogs were served.
Explanation:
At the hotdog stand, they serve regular and foot-long hotdogs at a ratio of 5 to 3. The total ratio of regular hotdogs to foot-long hotdogs served would be 5 + 3 = 8
If the total number of hotdogs served at the hot dog stand is 120, it means that the number of foot long hotdogs that will be served is
3/8 × 120 = 45