The school library purchased a total of 400 science and technology books, literature and art books and story books. Science and technology books account for 30%, and the ratio of literature and art books to story books is 4:3. How many literature and art books are there?
学校图书馆购进科技书，文艺书和故事书共400本．科技书占30%，文艺书和故事书的本数比是4：3，文艺书有多少本？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">400 * (7/10) * (4/7)</gadget>
<output>160</output>

<result>160</result>