The school library buys 180 science and technology books, which is 18 less than the number of story books (2/3). How many story books does the school buy?
学校图书室购买科技书180本，比故事书本数的(2/3)少18本，学校购买故事书多少本？
<gadget id="calculator">180 + 18</gadget>
<output>198</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">198 / (2/3)</gadget>
<output>297</output>

<result>297</result>