When Niu Niu is doing a two-digit addition, he regards the 2 in the ones place of an addend as 5, and the 3 in the tens place as 6, and the result is 83. What is the correct result?
牛牛在做一道两位数的加法时，把一个加数的个位上的2看成了5，十位上的3看成了6，算得结果是83，正确的结果应是多少．
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">60 - 30</gadget>
<output>30</output>

<gadget id="calculator">83 - 3 - 30</gadget>
<output>50</output>

<result>50</result>