A batch of books, if each pack is 50 books, can hold 330 packs, now each pack is 55 books, how many packs can it hold? (Solve with ratio)
一批书，如果每包装50本，可以装330包，现在每包装55本，可以装多少包？(用比例解)
<gadget id="calculator">50 * 330</gadget>
<output>16_500</output>

<gadget id="calculator">16_500 / 55</gadget>
<output>300</output>

<result>300</result>