To make a batch of clothes, each set actually uses 2 meters of cloth, which is 0.4 meters less than planned, and actually makes 600 sets of clothes; how many sets were originally planned?
做一批衣服，实际每套用布2米，比计划节约0.4米，实际做600套衣服的布料；原计划做多少套？
<gadget id="calculator">2 + 0.4</gadget>
<output>2.4</output>

<gadget id="calculator">600 / 2.4</gadget>
<output>250</output>

<gadget id="calculator">2 * 250</gadget>
<output>500</output>

<result>500</result>