There are 60 chickens in the farm, the number of ducks is three times that of chickens, and the number of geese is 7 fewer than ducks. How many geese are there?
养殖场里面有鸡60只，鸭的只数是鸡的3倍，鹅的只数比鸭少7只，鹅有多少只？
<gadget id="calculator">60 * 3</gadget>
<output>180</output>

<gadget id="calculator">180 - 7</gadget>
<output>173</output>

<result>173</result>