A batch of new books will be donated to the fifth grade. If each person has 3 copies, it can be distributed to 15 people. If each person has 5 books, how many people can be distributed?
一批新书要捐给五年级．如果每人3本，正好可以发给15人．如果每人5本，可以分给几个人？
<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>