book with 300 pages, read the whole book (2/7) on the first day, and read more (2/5) on the second day than the first day, how many pages are left?
一本书300页，第一天看了全书的(2/7)，第二天比第一天多看(2/5)，还剩下多少页？
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">300 * (2/15)</gadget>
<output>40</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">300 * (2/15) * (7/5)</gadget>
<output>56</output>

<gadget id="calculator">300 - 40 - 56</gadget>
<output>204</output>

<result>204</result>