Lili read a book, read the whole book every day (1/13), how much did she read the whole book in 4 days.
丽丽看了一本书，每天看全书的(1/13)，4天看了全书的多少．
<gadget id="calculator">1 / 13</gadget>
<output>1/13 = around 0.076923</output>

<gadget id="calculator">(1/13) * 4</gadget>
<output>4/13 = around 0.307692</output>

<result>4/13 = around 0.307692</result>