I need help in math help pls :P

Question

Manuel had a collection of 156 baseball cards. He gives 1/6 of his collection to his neighbor, Samuel. Of the remaining baseball cards, 20% were ruined by his dog. How many baseball cards are now in Manuel’s collection?

Answer 1

1/6 of 156 = 26, leaving 130

1/5 of 130 = 26 leaving 104 cards