The sum of three consecutive even numbers is 120, what is the largest number among them?
三个连续偶数的和是120，其中最大的一个数是多少．
<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<gadget id="calculator">40 + 2</gadget>
<output>42</output>

<result>42</result>