In the subtraction formula, the sum of the minuend, the subtrahend and the difference is 700, the subtrahend is 50, and the difference is (how much).
在减法算式中，被减数、减数、差之和为700，减数是50，差是(多少)．
<gadget id="calculator">700 / 2</gadget>
<output>350</output>

<gadget id="calculator">350 - 50</gadget>
<output>300</output>

<result>300</result>