A new batch of books has arrived at Xinhua Bookstore. If there are 20 books in each pack, 18 packs should be bundled. If you want to bundle 15 packs, how many copies per pack?
新华书店新到一批书，这批书如果每包20本，要捆18包．如果要捆成15包，每包多少本？
<gadget id="calculator">18 / 15</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">20 * (6/5)</gadget>
<output>24</output>

<result>24</result>