There are 145 students in the first grade of Xingguang Primary School, 160 students in the second grade, and 184 students in the third grade. How many students are there on average in each grade?
星光小学一年级有145人，二年级有160人，三年级有184人，平均每个年级有多少人？
<gadget id="calculator">145 + 160 + 184</gadget>
<output>489</output>

<gadget id="calculator">489 / 3</gadget>
<output>163</output>

<result>163</result>