The flour extraction rate of a kind of wheat is 85%. Now it is necessary to grind 340 kilograms of flour. How many kilograms of this kind of wheat are needed?
一种小麦的出粉率是85%，现要磨出340千克面粉，需要这种小麦多少千克？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">340 / (17/20)</gadget>
<output>400</output>

<result>400</result>