If you have 25 cases of led for a led pencil, and your friend has 1/5 cases less than you. You give them 1/3 of your 25 cases of led to your friend. How many cases of led does your friend have at the end of the day?

Your friend has (4/5) (25) = 20 at first

(1/3)(25) = 25/3 cases

20 + 25/3 =

60/3 + 25/3 =

85/3 cases