There are 2800 science and technology books in the school library, and 120 fewer story books than science and technology books (6/7). How many story books and science and technology books are there in the school library?
学校图书室有科技书2800本，故事书比科技书的(6/7)少120本，学校图书室故事书和科技书共有多少本？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">2_800 * (6/7)</gadget>
<output>2_400</output>

<gadget id="calculator">2_400 - 120</gadget>
<output>2_280</output>

<gadget id="calculator">2_800 + 2_280</gadget>
<output>5_080</output>

<result>5_080</result>