If the sum of 3 consecutive even numbers is 30, what is the largest of these numbers?
3个连续偶数和是30，那么这个数中最大的是多少．
<gadget id="calculator">30 / 3</gadget>
<output>10</output>

<gadget id="calculator">10 + 2</gadget>
<output>12</output>

<result>12</result>