book has page a. If you read (1/2) of the whole book on the first day and the rest (1/3) on the second day, how many pages are you finished reading?
一本书有a页，第一天读了全书的(1/2)，第二天读了余下的(1/3)，则读完的页数为多少a
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>