A three-digit number is both a multiple of 12 and a multiple of 5, and 9 is its factor. What is the largest three-digit number?
一个三位数，既是12的倍数，又是5的倍数，且9又是它的因数，这个三位数最大的是多少．
<gadget id="calculator">3 * 4 * 3 * 5</gadget>
<output>180</output>

<gadget id="calculator">180 * 5</gadget>
<output>900</output>

<result>900</result>