The Spring Festival is approaching. A certain supermarket purchased 380 small lanterns, 20 more than three times the large lanterns purchased. How many large lanterns did the supermarket buy?
春节快到了，某超市购进380个小灯笼只小中国节，比购进的大灯笼的3倍多20个，超市购进多少个大灯笼？
<gadget id="calculator">380 - 20</gadget>
<output>360</output>

<gadget id="calculator">360 / 3</gadget>
<output>120</output>

<result>120</result>