There was a batch of children's shoes in the store, and 234 pairs were sold in 6 days. According to this sales speed, it took another 15 days to sell out these children's shoes. How many pairs of these children's shoes are there?
商店有一批童鞋，6天售出234双，照这样的销售速度，又卖了15天才将这批童鞋卖完．这批童鞋共有多少双？
<gadget id="calculator">234 / 6</gadget>
<output>39</output>

<gadget id="calculator">39 * 15</gadget>
<output>585</output>

<gadget id="calculator">585 + 234</gadget>
<output>819</output>

<result>819</result>