Subtracting 487 from a number, the little sloppy swapped the hundreds and tens digits of the subtrahend, and the result was 172, so what is the correct difference
一个数减去487，小马虎将被减数的百位和十位上的数字互换了，结果得172，那么正确的差是多少
<gadget id="calculator">569 - 487</gadget>
<output>82</output>

<result>82</result>