Graciella is planning to give away half of her books. She currently has 28 hardcover books and 19 paperback books. Which of the following equations can be used to find b, the number of books Graciella will give away?
A. b=(28+19) multiplied by 2
B. b=(28+19) divided by 2
C. b=(28+19) divided by 1/2
D. b= 28+19 divided by 2