100 kilograms of wheat can process 75 kilograms of flour, the factory needs 300 kilograms of flour, how many kilograms of wheat are needed.
100千克小麦能加工75千克面粉，工厂需要300千克面粉，需要小麦多少千克．
<gadget id="calculator">300 / 75</gadget>
<output>4</output>

<gadget id="calculator">4 * 100</gadget>
<output>400</output>

<result>400</result>