A, B, and C each have some comic strips. After A gives B 3 copies and B gives C 5 copies, the three people have the same number of comic books. How many copies does B have more than C?
甲、乙、丙三人各有一些连环画，甲给乙3本，乙给丙5本后，三个人书的本数同样多，乙原来比丙多多少本？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">2 + 5</gadget>
<output>7</output>

<result>7</result>