A book with 300 pages, read the whole book (1/3) in the first week, and the number of pages read in the second week is (2/5) in the first week, how many pages did you read in the second week?
一本书300页，第一星期看了全书的(1/3)，第二星期看的页数是第一星期的(2/5)，第二星期看多少页？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">300 * (1/3) * (2/5)</gadget>
<output>40</output>

<result>40</result>