A batch of children's clothing in a clothing store is very popular. On the first day, 45 sets of children's clothing were sold. On the second day, the same number of children's clothing was shipped in, and the amount brought in was the same as that left after the sale. At this time, there were 324 sets in total. The clothing store originally had children's clothing. How many sets?
服装店有一批童装很畅销，第一天卖了45套，第二天又运进一些同样的童装，运进的与卖出后剩的同样多，这时共有324套，服装店原来有童装多少套？
<gadget id="calculator">324 / 2</gadget>
<output>162</output>

<gadget id="calculator">162 + 45</gadget>
<output>207</output>

<result>207</result>