A car factory produced 8,200 cars in the whole year last year, and the production in the second half of the year was 1/20 more than that in the first half of the year. How many cars did the car factory produce in the first half of the year?
一个汽车制造厂，去年全年生产8200辆汽车，其中下半年比上半年多生产(1/20)，这个汽车制造厂上半年生产了多少辆汽车？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 + (1/20) + 1</gadget>
<output>41/20 = around 2.05</output>

<gadget id="calculator">8_200 / (41/20)</gadget>
<output>4_000</output>

<result>4_000</result>