A, B, and C have 175 books in total. The ratio of books between A and B is 2:3, and the ratio of books between B and C is 4:5. How many books does B have?
甲乙丙三人共有图书175本，甲和乙的图书比是2：3，乙和丙的图书比是4：5，乙有多少本图书．
<gadget id="calculator">8 + 12 + 15</gadget>
<output>35</output>

<gadget id="calculator">12 / 35</gadget>
<output>12/35 = around 0.342857</output>

<gadget id="calculator">175 * (12/35)</gadget>
<output>60</output>

<result>60</result>