When Xiaohong was doing the calculation problem, due to her carelessness, she mistakenly took the 8 in the ones place of an addend as 3, and the 6 in the tens place as 9, and the sum she got was 138. What is the correct sum? (writing process)
小红做计算题时，由于粗心大意，把一个加数个位上的8错误地当作了3，把十位上的6错当成了9，所得的和是138，正确的和是多少？(写过程)
<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">90 - 60</gadget>
<output>30</output>

<gadget id="calculator">5 - 30</gadget>
<output>-25</output>

<gadget id="calculator">138 + (-25)</gadget>
<output>113</output>

<result>113</result>