There are 1,100 books in the two bookshelves A and B. After borrowing (1/3) from A bookshelf and borrowing 75% from B bookshelf, A bookshelf is twice as large as B bookshelf and 150 books more. So how much is B bookshelf? book.
甲，乙两个书架共有1100本书，从甲书架借出(1/3)，从乙书架借出75%以后，甲书架是乙书架的2倍还多150本，那么乙书架原有多少本书．
<gadget id="calculator">1_100 * 2</gadget>
<output>2_200</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1_100 * (3/4) * 2</gadget>
<output>1_650</output>

<gadget id="calculator">150 - 1_650</gadget>
<output>-1_500</output>

<gadget id="calculator">2_200 + (-1_500)</gadget>
<output>700</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/4) * 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">2 - (1/3) - (3/2)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 + (1/6)</gadget>
<output>7/6 = around 1.166667</output>

<gadget id="calculator">700 / (7/6)</gadget>
<output>600</output>

<gadget id="calculator">1_100 - 600</gadget>
<output>500</output>

<result>500</result>