and B have a total of 128 books, and B and C have a total of 160 books. The number of A's books is C's (3/7), how many books does B have.
甲乙共有图书128本，乙丙共有图书160本．甲的图书本数是丙的(3/7)，乙有图书多少本．
<gadget id="calculator">160 - 128</gadget>
<output>32</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">32 / (4/7)</gadget>
<output>56</output>

<gadget id="calculator">160 - 56</gadget>
<output>104</output>

<result>104</result>