When the little sloppy was doing an addition problem, he mistook an 8 in the tens place of an addend as a 3, and a 6 in the ones place as a 9, and the result was 11.5. What is the correct result?
小马虎在做一道加法题时，把一个加数十分位上的8错看成了3，个位上的6错看成了9，结果得到的和是11.5，正确的结果是多少？
<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<gadget id="calculator">11.5 - 3</gadget>
<output>8.5</output>

<gadget id="calculator">0.8 - 0.3</gadget>
<output>0.5</output>

<gadget id="calculator">8.5 + 0.5</gadget>
<output>9</output>

<result>9</result>