When the little sloppy was calculating an addition problem, he regarded the "1" in the tens place as 7, and the result was 502. What is the correct answer?
小马虎在计算一道加法题时，把十位上的"1"看成了7，结果得502，正确答案是多少．
<gadget id="calculator">70 - 10</gadget>
<output>60</output>

<gadget id="calculator">502 - 60</gadget>
<output>442</output>

<result>442</result>