The flour extraction rate of wheat is 85%, how many kilograms of wheat are needed to grind 3400 kilograms of flour.
小麦出粉率为85%，要磨3400千克面粉需要小麦多少千克．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">3_400 / (17/20)</gadget>
<output>4_000</output>

<result>4_000</result>