Read a book, read the whole book every day (2/15), how much of the whole book in 2 days.
看一本书，每天看全书的(2/15)，2天看了全书的多少．
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(2/15) * 2</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>