Answer:
7 cartons.
Explanation:
To do this we can use division, to see how many cartons are needed.
The expression would be:
26/4
This equals 6.5
However, we can't buy half a carton meaning we need 7 cartons to ensure each guest has a serving.
6 cartons would serve 24 people, and 2 guests wouldn't have a serving.
(6*4=24)