The school bought four kinds of books, science and technology books (3/4), comic books (1/3) of the other three books, history and geography (1/4), history and geography There are 80 fewer books than literary books. How many books of the four kinds were bought back?
学校里买回四种图书，科技书是文艺书的(3/4)，连环画是其余三种书的(1/3)，史地书是其余三种书的(1/4)，史地书比文艺书少80本，买回的四种书共有多少本？
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

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

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/4) - (1/5)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 + (3/4)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">(11/20) / (7/4)</gadget>
<output>11/35 = around 0.314286</output>

<gadget id="calculator">(11/35) - (1/5)</gadget>
<output>4/35 = around 0.114286</output>

<gadget id="calculator">80 / (4/35)</gadget>
<output>700</output>

<result>700</result>