The flour extraction rate of a kind of wheat is 60%. If you want to ensure that the flour yield is 300 kg, at least how many kilograms of this wheat should be prepared.
一种小麦的出粉率是60%，如果要保证出粉300千克，至少要准备这种小麦多少千克才行．
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">300 / (3/5)</gadget>
<output>500</output>

<result>500</result>