Xiaguang Garment Factory signed a supply contract for 1,200 sets of children's clothing with a shopping mall. After 4 days of production at the speed of processing 150 sets per day, the mall requires that all the remaining clothes must be supplied within 3 days. How many sets of clothing should Xiaguang Garment Factory process on average every day?
霞光服装厂与某商场签订了1200套儿童服装的供货合同．在以每天加工150套的速度，生产了4天后，商场要求剩下的服装必须在3天内全部供出．霞光服装厂接下来平均每天应加工多少套服装？
<gadget id="calculator">150 * 4</gadget>
<output>600</output>

<gadget id="calculator">1_200 - 600</gadget>
<output>600</output>

<gadget id="calculator">600 / 3</gadget>
<output>200</output>

<result>200</result>