The flour extraction rate of wheat is about 85%, how many kilograms of wheat is needed to grind 5100 kilograms of flour.
小麦出粉率约是85%，要磨面粉5100千克，需要小麦多少千克．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">5_100 / (17/20)</gadget>
<output>6_000</output>

<result>6_000</result>