The sum of three consecutive even numbers is 60, what is the largest number among them?
三个连续偶数的和是60，其中最大的一个数是多少．
<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<gadget id="calculator">20 + 2</gadget>
<output>22</output>

<result>22</result>