There are 250 chickens in a farm, and the number of ducks is three times that of chickens. The total number of chickens and ducks is 70 more than the number of geese. How many geese do you raise?
某饲养场中养鸡250只，养鸭的只数是鸡的3倍，鸡、鸭总数比养鹅的只数多70只．养鹅多少只？
<gadget id="calculator">250 * 3</gadget>
<output>750</output>

<gadget id="calculator">750 - 70</gadget>
<output>680</output>

<gadget id="calculator">250 + 680</gadget>
<output>930</output>

<result>930</result>