There are 360 chickens in the farm, which is three times that of geese, and the number of ducks is 20 less than four times that of geese. How many ducks are there in the farm?
饲养场有鸡360只，是鹅的3倍，鸭的只数比鹅的4倍少20只，饲养场养鸭多少只？
<gadget id="calculator">360 / 3</gadget>
<output>120</output>

<gadget id="calculator">120 * 4</gadget>
<output>480</output>

<gadget id="calculator">480 - 20</gadget>
<output>460</output>

<result>460</result>