There are two bookshelves, A and B. There are 600 books on shelf A. The books on shelf A are lent out (1/3), and the books on shelf B are lent out (1/6). At this time, the number of books on shelf A is twice that of shelf B. If there are 100 more books, how many books are there in Bookshelf B?
甲、乙两个书架，甲书架有书600本，甲书架的书借出(1/3)，乙书架的书借出(1/6)，这时甲书架的书比乙书架的2倍多100本，那么乙书架原有书多少本？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">600 * (1/3)</gadget>
<output>200</output>

<gadget id="calculator">600 - 200 - 100</gadget>
<output>300</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">300 / 2 / (5/6)</gadget>
<output>180</output>

<result>180</result>