Xiaohua reads a story book, the first week I read this book (3/7), it is exactly 300 pages, and the second week I read this book again (3/10), how much did I read in two weeks? Page.
小华读一本故事书，第一周读了这本书的(3/7)，正好是300页，第二周又读了这本书的(3/10)，两周一共读了多少页．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">300 / (3/7)</gadget>
<output>700</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">700 * (3/10)</gadget>
<output>210</output>

<gadget id="calculator">210 + 300</gadget>
<output>510</output>

<result>510</result>