The flour extraction rate of wheat is 85%. To grind 340 tons of flour, how many tons of wheat are needed?
小麦的出粉率是85%，要磨粉340吨，需要小麦多少吨？
<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>