Niu Niu borrowed a 475-page story book from the library, and has read it for 3 days, and the remaining pages are 55 pages more than the number of pages he has read. How many pages does Niu Niu read on average every day?
牛牛从图书馆借了一本475页的故事书，已经看了3天，剩下的页数比已经看的页数多55页．牛牛平均每天看几页？
<gadget id="calculator">475 - 55</gadget>
<output>420</output>

<gadget id="calculator">420 / 2 / 3</gadget>
<output>70</output>

<result>70</result>