The school bought 500 story books, science and technology books accounted for (4/5) of the story books, literature and art books accounted for (3/8) of the science and technology books, how many literature and art books were bought?
学校买来故事书500本，科技书占故事书的(4/5)，文艺书占科技书的(3/8)，买来文艺书多少本？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">500 * (4/5) * (3/8)</gadget>
<output>150</output>

<result>150</result>