When two numbers are divided, the quotient is 9 and the remainder is 20. What is the smallest dividend?
两数相除，商9余20，被除数最小是多少．
<gadget id="calculator">21 * 9</gadget>
<output>189</output>

<gadget id="calculator">189 + 20</gadget>
<output>209</output>

<result>209</result>