Answer:
If each carton can feed 4 people, then you can buy 7 carton and feed 4 people per carton with leftovers expected, or you can buy 5 carton and serve 5 people per carton with no leftovers
Step-by-step explanation:
5 carton × 5 = 25 people fed
while 7 carton × 4 = 28 people = 25 people fed plus leftover for 3 people