Ryan bought a total of 40 juice boxes. He bought 8 more boxes of apple juice than of grape juice. How many of each kind did he buy?

we take away the extra 8 boxes of apple juice first:

40 - 8 = 32

Now that we have equal number of apple juice and graph juice, we divide them into 2:

32 : 2 = 16

There are 16 boxes of graph juice.

We add back the 8 boxes of apple juice we took away just now

16 + 8 = 24

There are 24 boxes of apple juice.

Answer: 24 boxes of apple juice and 16 boxes of graph juice.