# How many basketballs are in the locker, if there are 18 baseballs and basketballs in one gym storage locker and there are 3 baseballs for every 6 basketballs in the locker?

There are $12$ basketballs.
So if there are $k$ baseballs, there are $2 k$ basketballs.
Since $k + 2 k = 18$, $k$ is $6$ so there are $6$ baseballs and $12$ basketballs.