student uses a calculator to calculate a problem. In the last step, he should divide by 10, but he multiplied by 10 by mistake. Therefore, the number of wrong answers obtained is 500. What is the correct answer?
一个学生用计算器算题，在最后一步应除以10，错误的乘以10了，因此得出的错误答数500，正确答案应是多少．
<gadget id="calculator">500 / 10</gadget>
<output>50</output>

<gadget id="calculator">50 / 10</gadget>
<output>5</output>

<result>5</result>