Teacher Wang moved books to the library, 15 books each time, exactly half of them were moved 12 times. The remaining 18 books are moved each time, how many more times will it take to finish the move?
王老师往图书室里搬书，每次搬15本，12次刚好搬了一半．剩下的每次搬18本，再要几次才能搬完？
<gadget id="calculator">12 / 18</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">15 * (2/3)</gadget>
<output>10</output>

<result>10</result>