When I was naughty doing a decimal subtraction problem, I wrongly wrote 9 in the ones place of the subtrahend as 6, and wrongly wrote 6 in the tens place of the subtrahend as 9, and the final difference was 15.48. What is the correct answer to this question?
淘气做一道小数减法题时，把被减数个位上的9错写成了6，减数十分位上的6错写成了9，最后所得的差是15.48．这道题正确的答案是多少？
<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<gadget id="calculator">0.9 - 0.6</gadget>
<output>0.3</output>

<gadget id="calculator">15.48 + 3 + 0.3</gadget>
<output>18.78</output>

<result>18.78</result>