Xiaojun reads a technical book. Read this technical book on the first day (1/7), and read this technical book on the second day (1/10). It is known that I read 9 more pages on the first day than on the second day, how many pages does Xiaojun have to read?
小军看一本科技书．第1天看了这本科技书的(1/7)，第2天又看了这本科技书的(1/10)．已知第1天比第2天多看了9页，小军还有多少页没有看完？
<gadget id="calculator">3 / 70</gadget>
<output>3/70 = around 0.042857</output>

<gadget id="calculator">9 / (3/70)</gadget>
<output>210</output>

<gadget id="calculator">53 / 70</gadget>
<output>53/70 = around 0.757143</output>

<gadget id="calculator">210 * (53/70)</gadget>
<output>159</output>

<result>159</result>