If the seven-digit number a20b06c is divisible by 9, how many groups of such a, b, and c are there?
如果七位数a20b06c能被9整除，那么这样的a、b、c共有多少组．
<gadget id="calculator">11 * 8</gadget>
<output>88</output>

<gadget id="calculator">12 + 88</gadget>
<output>100</output>

<result>100</result>