The flour extraction rate of a kind of wheat is 85%, how many tons of wheat are needed to grind 13.6 tons of flour.
一种小麦出粉率为85%，要磨13.6吨面粉，需要小麦多少吨．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">13.6 / (17/20)</gadget>
<output>16</output>

<result>16</result>