Li Xing reads a book, read the whole book every day (1/19), how much of the whole book he read in 3 days.
李行看一本书，每天看全书的(1/19)，3天看了全书的多少．
<gadget id="calculator">1 / 19</gadget>
<output>1/19 = around 0.052632</output>

<gadget id="calculator">(1/19) * 3</gadget>
<output>3/19 = around 0.157895</output>

<result>3/19 = around 0.157895</result>