Jingjing has been reading a 129-page storybook for 7 days, 12 pages a day, and 15 pages a day for the rest, how many days can she finish it?
晶晶看一本129页的故事书，已经看了7天，每天看12页，剩下的每天看15页，再用几天可以看完？
<gadget id="calculator">7 * 12</gadget>
<output>84</output>

<gadget id="calculator">129 - 84</gadget>
<output>45</output>

<gadget id="calculator">45 / 15</gadget>
<output>3</output>

<result>3</result>