Kobayashi reads a book. He reads (1/3) of the whole book on the first day and the rest (1/2) on the second day. How much of the book did he read in two days?
小林读一本书，第一天读了全书的(1/3)，第二天读了余下的(1/2)，两天一共读了这本书的几分之？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(2/3) * (1/2)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) + (1/3)</gadget>
<output>2/3 = around 0.666667</output>

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