Uncle Wang received a bonus of 390 yuan in March, and 450 yuan each in April and May. How much is the average monthly bonus?
王叔叔三月份得奖金390元，四、五月份各得奖金450元．平均每月得奖金多少元？
<gadget id="calculator">450 * 2</gadget>
<output>900</output>

<gadget id="calculator">390 + 900</gadget>
<output>1_290</output>

<gadget id="calculator">1_290 / 3</gadget>
<output>430</output>

<result>430</result>