Xiaohua has a book. He read the whole book (3/10) on the first day and the whole book (4/10) on the second day. What percentage of the whole book did he read in two days?
小华有一本书，第一天看了全书的(3/10)，第二天看了全书的(4/10)，两天一共看了全书的几分之几？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/10) + (2/5)</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>