A garment factory has 1,200 meters of cloth, first make 150 sets of adult clothes, each set uses 5 meters of cloth, and the rest makes children's clothes, each set uses 3 meters of cloth, how many sets of children's clothes can be made? (solution by equation)
某服装厂有布1200米，先做大人服装150套，每套用布5米，剩下的做小孩衣服，每套用布3米，可以做小孩衣服多少套？(用方程解)
<gadget id="calculator">150 * 5</gadget>
<output>750</output>

<gadget id="calculator">1_200 - 750</gadget>
<output>450</output>

<gadget id="calculator">450 / 3</gadget>
<output>150</output>

<result>150</result>