The school bought a batch of books, among which the story books are literature and art books (5/6), literature and art books are science and technology books (6/7), there are 700 science and technology books, how many story books are there?
学校买来一批书，其中的故事书是文艺书的(5/6)，文艺书是科技书的(6/7)，科技书有700本，故事书有多少本？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">700 * (6/7) * (5/6)</gadget>
<output>500</output>

<result>500</result>