The students went to work in the vegetable garden. The fifth grade picked 320 kilograms of radishes, which was 1.6 times that of the fourth grade students. How many kilograms were picked by the fourth and fifth graders?
同学们到菜园劳动，五年级摘320千克萝卜，是四年级同学摘的1.6倍，四、五年级一共摘多少千克？
<gadget id="calculator">320 / 1.6</gadget>
<output>200</output>

<gadget id="calculator">200 + 320</gadget>
<output>520</output>

<result>520</result>