Xiao Ming reads a storybook. He reads 56 pages on the first day, 12 more pages on the second day, and 47 pages on the third day. How many pages does he read on average every day?
小明看一本故事书，第一天看了56页，第二天比第一天多看了12页，第三天看了47页，他平均每天看多少页？
<gadget id="calculator">56 + 12</gadget>
<output>68</output>

<gadget id="calculator">56 + 68 + 47</gadget>
<output>171</output>

<gadget id="calculator">171 / 3</gadget>
<output>57</output>

<result>57</result>