There are 20 roosters in a chicken farm, and the number of hens is 5 times that of roosters. How many chickens are there in the chicken farm?
养鸡场养了20只公鸡，母鸡的只数是公鸡的5倍．养鸡场一共有多少只鸡？
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">100 + 20</gadget>
<output>120</output>

<result>120</result>