Answer:
Hazel have 200 baseball cards in her collection.
Explanation:
Let the number of card Hazel's have be x.
Given:
Hazel brother have = 80 cards
Also Given:
The number of cards in 4/5 of Hazel's baseball card collection is equal to twice the number in her brother's collection.
It means that 4/5 times of hazel card is equal to 2 multiplied with the number of cards hazel brother have.
Framing in equation form we get;

Hence Hazel have 200 baseball cards in her collection.