Answer:
Treats that clean teeth: 4 packages
Gourmet treats: 3 packages
Explanation:
He bought 26 treats in all in 7 packages.
20/5 is 4
26-20 is 6
6/2 is 3
20 plus 6 is 26, so the amount of treats is correct.
3 plus 4 is 7, so the amount of packages is correct.