The number A is 100, the number B is 206, and the number C is 174. What is the average of these three numbers?
甲数是100，乙数是206，丙数是174，这三个数的平均数是多少．
<gadget id="calculator">100 + 206 + 174</gadget>
<output>480</output>

<gadget id="calculator">480 / 3</gadget>
<output>160</output>

<result>160</result>