There are 600 parts in a batch, all (3/10) are completed on the first day, and all (1/6) are completed on the second day, what fraction of the total is completed in two days? How many parts were completed in two days?
一批零件有600个，第一天完成了全部的(3/10)，第二天完成了全部的(1/6)，两天一共完成了全部的几分之几？两天一共完成了多少个零件？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(3/10) + (1/6)</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">600 * (7/15)</gadget>
<output>280</output>

<result>280</result>