When Xiaocheng was doing a subtraction problem, he mistakenly regarded the 2 in the tens digit of the subtrahend as 7, and the 5 in the subtrahend unit digit as 8, and the result was 592. What is the correct difference.
小诚在做一道减法题时，错把被减数十位上的2看作7，减数个位上的5看作8，结果得到的是592．正确的差是多少．
<gadget id="calculator">70 - 20</gadget>
<output>50</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">50 - 3</gadget>
<output>47</output>

<gadget id="calculator">592 - 47</gadget>
<output>545</output>

<result>545</result>