Li Gang reads a book, on the first day he reads (1/5) of the whole book, on the second day he reads (1/3) more than on the first day, and how much he reads the whole book on the second day.
李刚看一本书，第一天看了全书的(1/5)，第二天比第一天多看了(1/3)，第二天看了全书的多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/5) * (1/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) + (1/5)</gadget>
<output>4/15 = around 0.266667</output>

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