Answer:
She will put 14 cars in each box.
Explanation:
Given:
Ian has 16 red cars and 12 black cars on the floor of his room.
He picks up all the cars and puts an equal number of cars into 2 boxes.
Now, to find the cars she will put in each box.
So, we add the both the red and black cars Ian has on the floor of his room:


Thus, total number of cars = 28.
As, given that he puts an equal number of cars into 2 boxes.
Now, we divide the total number of cars by 2 to get the number of cars she will put in each box:


Therefore, she will put 14 cars in each box.