Respuesta :

mayajackson2021
3 cartons
She had 5straw 4blue
She needs 12
12-5-4= 3
So she needs 3 more to have 12
mathstudent55

Answer:

3

Step-by-step explanation:

She has 5 + 4 = 9 cartons.

She needs 12, so 12 - 9 = 3. She needs 3 more cartons.