two-digit number is divisible by 2 and 5 at the same time, and has a divisor of 3. What is the largest number of this number?
一个两位数，能同时被2、5整除，且有约数3，这个数最大是多少．
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<result>90</result>