Xiaoxin reads a 187-page book, reads 67 pages in the first 4 days, and finishes it in the remaining 6 days. How many pages does Xiaoxin read on average every day?
小欣看一本187页的书，前4天看了67页，剩下的6天看完．小欣平均每天看多少页？
<gadget id="calculator">187 - 67</gadget>
<output>120</output>

<gadget id="calculator">120 / 6</gadget>
<output>20</output>

<result>20</result>