A, B, and C each put out the same amount of money to buy the same book. When distributing, A wants 22 books, B wants 23 books, and C wants 30 books. How much do you want to give B?
甲、乙、丙三人各拿出相同多的钱去买同样的图书，分配时，甲要22本，乙要23本，丙要30本，因此，丙要还给甲13.5元，丙还要给乙多少元．
<gadget id="calculator">30 + 22 + 23</gadget>
<output>75</output>

<gadget id="calculator">75 / 3</gadget>
<output>25</output>

<gadget id="calculator">25 - 22</gadget>
<output>3</output>

<gadget id="calculator">13.5 / 3</gadget>
<output>4.5</output>

<gadget id="calculator">4.5 * 2</gadget>
<output>9</output>

<result>9</result>