A factory produces a batch of electric vehicles, 60 of which are produced on the first day, and the remaining 35% are produced on the second day. At this time, half of them are not produced. How many electric vehicles are there in this batch?
某厂生产一批电动车，第一天生产了60辆，第二天生产了余下的35%，这时还有一半没有生产，这批电动车有多少辆？
<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">60 * (7/20)</gadget>
<output>21</output>

<gadget id="calculator">60 - 21</gadget>
<output>39</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) - (7/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">39 / (3/20)</gadget>
<output>260</output>

<result>260</result>