A chicken farm produced a total of 5160 boxes of eggs last year, of which the production in the second half of the year increased by 15% compared with the first half of the year. How many boxes were produced in the first half of the year?
某养鸡场去年共产鸡蛋5160箱，其中下半年比上半年增产一成五，上半年生产了多少箱？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 + (3/20) + 1</gadget>
<output>43/20 = around 2.15</output>

<gadget id="calculator">5_160 / (43/20)</gadget>
<output>2_400</output>

<result>2_400</result>