The new semester has started. The first class, the second class, and the third class have to go to the teaching office to pick up the books. For every 2 copies taken away by class 1, 3 copies are taken away by class 3; 5 copies are taken away by class 2. The third class took 6 copies. In the end, a total of 225 books were taken away, how many books were taken away by one class.
新学期开学了．一班、二班、三班要去教导处领书．一班每取走2本，三班就取走3本；二班每取走5本．三班就取走6本．最后一共有225本书被取走了，则一班取走了多少本．
<gadget id="calculator">4 + 6 + 5</gadget>
<output>15</output>

<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">225 * (4/15)</gadget>
<output>60</output>

<result>60</result>