Answer:
112 if you don't include the triangle sides as they are not necessary, but 124 if you include one triangle and 136 if you include both triangle sides
40 ÷ 2.40= 16.66
the teacher can buy 16 cookies
2
3
2
4
I hope this helps!
Extended response is in order
Answer is 7, 9, 11, 12, and 15 lbs.