When doing an integer addition problem, a student mistook the 6 in the ones place as 9, and the 8 in the tens place as 3. The result was that the "sum" was 123. What is the correct answer?
做一道整数加法题时，一个学生把个位上的6错误地看作9，把十位上的8错误地看作3，结果得出"和"为123，问正确的答案应该是多少．
<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<gadget id="calculator">123 - 3</gadget>
<output>120</output>

<gadget id="calculator">80 - 30</gadget>
<output>50</output>

<gadget id="calculator">120 + 50</gadget>
<output>170</output>

<result>170</result>