x, y, z are three consecutive even numbers, y=4, then x+y+z=how much.
x、y、z是三个连续偶数，y=4，那么x+y+z=多少．
<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">2 + 4 + 6</gadget>
<output>12</output>

<result>12</result>