Xingqing Electric Appliance Factory planned to produce 504 sets of color TVs in June, but actually completed half a month (5/6) and the second half (2/3). How many sets were overfulfilled in June?
兴庆电器厂六月份计划生产彩电504台，实际上半月完成了(5/6)，下半月完成(2/3)，六月份超额完成多少台？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(5/6) + (-1/3)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">504 * (1/2)</gadget>
<output>252</output>

<result>252</result>