There are 10 candles on the table, 2 candles were blown out by the wind first, and 4 candles were blown out by the wind soon, how many candles are left in the end?
桌子上点着10支蜡烛，先被风吹灭了2支，不久又被风吹灭了4支，最后剩下多少支．
<gadget id="calculator">2 + 4</gadget>
<output>6</output>

<result>6</result>