A shopping mall sold 276 pairs of shoes on Sunday, twice as much as on Monday. How many pairs of shoes did you sell on Monday?
某商场星期天卖出276双鞋，是星期一卖出的2倍．星期一卖出多少双鞋？
<gadget id="calculator">276 / 2</gadget>
<output>138</output>

<result>138</result>