Obviously doing a subtraction problem, I copied the subtraction wrong. The subtrahend should be 24, but he copied it into 42, and the calculated difference is 50. How much do you calculate the correctness of this question?
明明做一道减法题，把减数抄错了．减数应该是24，他抄成了42，算出的差是50．你算算这道题正确的差是多少？
<gadget id="calculator">50 + 42</gadget>
<output>92</output>

<gadget id="calculator">92 - 24</gadget>
<output>68</output>

<result>68</result>