There are two bookshelves, A and B. There are 120 books in A bookshelf. Take 24 books from A bookshelf to B bookshelf. Then (2/3) of B bookshelf is exactly 75% of A bookshelf. How many books are there in B bookshelf?
甲、乙两个书架，甲书架有120本书，从甲书架拿24本到乙书架，则乙书架的(2/3)正好是甲书架的75%，乙书架原来有多少本书？
<gadget id="calculator">120 - 24</gadget>
<output>96</output>

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

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/4) / (2/3)</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">96 * (9/8)</gadget>
<output>108</output>

<gadget id="calculator">108 - 24</gadget>
<output>84</output>

<result>84</result>