Obviously reading a story book, I read the whole book (1/8) on the first day, and (2/8) the whole book on the second day. What fraction of the whole book can be read to finish the book on the third day?
明明看一本故事书，第一天看了全书的(1/8)，第二天看了全书的(2/8)．第三天看全书的几分之几才能把这本书看完？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/8) - (1/4)</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>