My father is 171 cm tall, my mother is 156 cm tall, and I am 123 cm tall. What is our average height in cm?
老爸身高171厘米，老妈身高156厘米，我身高123厘米，我们的平均身高是多少厘米．
<gadget id="calculator">171 + 156 + 123</gadget>
<output>450</output>

<gadget id="calculator">450 / 3</gadget>
<output>150</output>

<result>150</result>