When Wang Bin reads a book, he reads the whole book (1/5) on the first day, and reads more (2/5) of the whole book on the second day than on the first day. How much of the whole book did you read in two days?
王彬看一本书，第一天看了全书的(1/5)，第二天比第一天多看了全书的(2/5)．两天一共看了全书的几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/5) + (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(1/5) + (3/5)</gadget>
<output>4/5 = around 0.8</output>

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