Adding a 0 at the end of the divisor is equal to the dividend. The divisor is 189 smaller than the dividend. What is the dividend?
在除数的末尾添上一个0就与被除数相等，除数比被除数小189，被除数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">189 / 9</gadget>
<output>21</output>

<gadget id="calculator">21 * 10</gadget>
<output>210</output>

<result>210</result>