The school library bought 15 packs of story books and 10 packs of science books, a total of 600 books, each pack of 18 story books, how many science books are in each pack? (Solution of column equation)
学校图书馆买来15包故事书和10包科技书，共600本，每包故事书18本，每包科技书多少本？(列方程解)
<gadget id="calculator">15 * 18</gadget>
<output>270</output>

<gadget id="calculator">600 - 270</gadget>
<output>330</output>

<gadget id="calculator">330 / 10</gadget>
<output>33</output>

<result>33</result>