There are 390 red sweaters in the store, three times as many as white sweaters. How many fewer white sweaters are in the store than red sweaters?
商店有红毛衣390件，是白毛衣的3倍，商店的白毛衣比红毛衣少几件？
<gadget id="calculator">390 / 3</gadget>
<output>130</output>

<gadget id="calculator">390 - 130</gadget>
<output>260</output>

<result>260</result>