The farm raises 1250 chickens and 800 ducks, and the number of geese is 650 fewer than the total number of chickens and ducks. How many geese are there on the farm?
农场养鸡1250只，养鸭800只，养的鹅比养的鸡和鸭的总数少650只．农场养鹅多少只？
<gadget id="calculator">800 - 650</gadget>
<output>150</output>

<gadget id="calculator">1_250 + 150</gadget>
<output>1_400</output>

<result>1_400</result>