A chemical fertilizer factory produces 310 tons of fertilizers in January, 400 tons of fertilizers in February, and 490 tons of fertilizers in March. How many tons of fertilizers are produced per month on average?
某化肥厂一月份生产化肥310吨，二月份生产化肥400吨，三月份生产化肥490吨，平均每月生产化肥多少吨？
<gadget id="calculator">310 + 400 + 490</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 / 3</gadget>
<output>400</output>

<result>400</result>