Uncle Li bought 23 boxes of beverages from the Internet for 943 yuan. If one box would cost 31 yuan from the mall, how much less did Uncle Li spend?
李叔叔从网上用943元购买了23箱饮料，如果从商场里面，一箱要花31元，李叔叔一共少花了多少钱？
<gadget id="calculator">31 * 23</gadget>
<output>713</output>

<gadget id="calculator">713 - 643</gadget>
<output>70</output>

<result>70</result>