Answer:
This question would be answered by doing devision because you are splitting the amount of cookies that should be delivered amongst 13 girls.
1,000/13
76.92307692
That is what came out in my calculator. I don't know if you need it in decimal or in a solid integer but if you were to round 76.9 you would get 77, it is always good to check your work so,
77 times 13
1001
That equals 1001 so that would help at least reach their goal of 1,000 boxes of cookies.
Explanation:
I really hope this helps!