When the little sloppy calculated 12.6 divided by a number, because the decimal point of the divisor was wrong by one place to the left, the result was 21. What is the correct answer.
小马虎在计算12.6除以一个数时，由于除数的小数点向左点错了一位，结果得21．正确的答案是多少．
<gadget id="calculator">21 / 10</gadget>
<output>21/10 = around 2.1</output>

<result>21/10 = around 2.1</result>