The number of books stored in the upper layer of a bookshelf is 30% of that in the lower layer, and the number of books stored in the lower layer is 14 more than that in the upper layer. How many books are stored in the upper layer of this bookshelf?
一个书架上层存放图书的本数是下层的30%，下层存放的图书比上层多14本，这个书架上层存放图书多少本？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">14 / (7/10)</gadget>
<output>20</output>

<gadget id="calculator">20 - 14</gadget>
<output>6</output>

<result>6</result>