A bookshelf has two floors and holds 186 books in total. If 25 books are taken out from the first floor, the second floor will have 11 more books than twice as many as the first floor. So how many books are there in the first layer?
一个书架有两层，共放186本书．如果从第一层拿出25本书后，第二层就比第一层的2倍多11本．那么第一层书有多少本．
<gadget id="calculator">186 - 11 - 25</gadget>
<output>150</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">150 / 3</gadget>
<output>50</output>

<result>50</result>