There are two bookshelves, A and B, and there are 300 books on shelf A. If (1/6) of the books on shelf A are placed on shelf B, then the number of books on shelf A and shelf B is equal. How many books are there on shelf B?
有甲、乙两个书架，甲书架有书300本，若把甲书架书的(1/6)放到乙书架，则甲、乙两个书架的书的本数相等．乙书架原来有书多少本？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6) - (1/6)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">300 * (2/3)</gadget>
<output>200</output>

<result>200</result>