In a chicken factory, hens account for 11/20 of the total number, 820 more than roosters. How many chickens are raised in total in the chicken factory? (solution by equation)
某养鸡厂母鸡占总数的(11/20)，比公鸡多820只，养鸡厂一共养鸡多少只？(用方程解)
<gadget id="calculator">11 / 20</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">(11/20) - 1</gadget>
<output>-9/20 = around -0.45</output>

<gadget id="calculator">(11/20) + (-9/20)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">820 / (1/10)</gadget>
<output>8_200</output>

<result>8_200</result>