Jen collects toy sports cars. She has 400 white cars and 160 green cars. She wants to line up the cars in groups so that each group has the same number of cars and contains only white cars or only green cars. What is the largest number that she can have in a group??

The largest number of cars that Jen can have in a group is enter your response here.

​(Simplify your answer. Type an​ integer. )

pls help asap