folktale has 170 pages in total. Xiao Ming reads 13 pages every day for the first 5 days, and wants to finish the rest in 7 days. How many pages do he need to read on average every day?
一本民间故事共有170页，小明前5天每天看13页，剩下的部分想7天看完，平均每天要看多少页？
<gadget id="calculator">13 * 5</gadget>
<output>65</output>

<gadget id="calculator">170 - 65</gadget>
<output>105</output>

<gadget id="calculator">105 / 7</gadget>
<output>15</output>

<result>15</result>