There are 400 science and technology books in the library, all of which are story books (5/8). How many story books and science books are there altogether?
图书馆有科技书400本，是故事书的(5/8)，故事书和科技书一共有多少本？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">400 / (5/8)</gadget>
<output>640</output>

<gadget id="calculator">640 + 400</gadget>
<output>1_040</output>

<result>1_040</result>