Read a book, read the whole book (2/5) every day, how much of the whole book in 2 days.
看一本书，每天看全书的(2/5)，2天看了全书的多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 2</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>