Respuesta :

Find how much 1 box costs by dividing.

9 ÷ 5 = 1.80

Now, multiply 1.80 by 20.

1.80 × 20 = 36

Answer:

20 boxes of cookies costs $36.

Answer:36$

Step-by-step explanation:So what you have to do is divide 20 by 5 and you get 4.Then multiply 4 by 9 and you  answer is 36.