There are some books, if every 24 books are bundled into a pack, 35 packs should be bundled. If every 30 books are bundled into a bundle, how many bundles will be bundled? (Solve with ratio)
有一些书，如果每24本捆成一包，要捆35包．如果每30本捆成一包，要捆多少包？(用比例解)
<gadget id="calculator">24 * 35</gadget>
<output>840</output>

<gadget id="calculator">840 / 30</gadget>
<output>28</output>

<result>28</result>