In a subtraction formula, the sum of the minuend, the subtrahend and the difference is 400, and the subtrahend is 80. What is the difference?
在一道减法算式中，被减数、减数、差的和为400，减数是80，差是多少？
<gadget id="calculator">400 / 2</gadget>
<output>200</output>

<gadget id="calculator">200 - 80</gadget>
<output>120</output>

<result>120</result>