There are 840 kilograms of rice in the cafeteria. The weight ratio of rice to flour is 5:2. How many kilograms of flour are there? How many.
食堂有大米840千克，大米和面粉的重量比是5：2，面粉有多少千克？多少．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">840 / (5/2)</gadget>
<output>336</output>

<result>336</result>