When the little sloppy was calculating an addition problem, he regarded the "5" in the tens place as "3", and the result was 784. What should be the correct answer.
小马虎在计算一道加法题时，把十位上的"5"看成了"3"，结果是784．正确的答案应是多少．
<gadget id="calculator">784 + 20</gadget>
<output>804</output>

<result>804</result>