The school bought three kinds of books, among which the number of literature and art books accounted for 1/4 of the total, the ratio of the number of science and technology books to story books was 3:4, and there were 360 story books. How many books are there in total?
学校买来了三种书，其中文艺书的本数占总数的(1/4)，科技书的本数与故事书的比是3：4，故事书有360本．三种书一共有多少本？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">360 * (3/4)</gadget>
<output>270</output>

<gadget id="calculator">360 + 270</gadget>
<output>630</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">630 / (3/4)</gadget>
<output>840</output>

<result>840</result>