Uncle Wang used 200 kg of wheat to grind 170 kg of flour. What is the flour extraction rate of the wheat?
王大爷用200千克的小麦磨出170千克的面粉，小麦的出粉率是多少？
<gadget id="calculator">170 / 200</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(17/20) * 1</gadget>
<output>17/20 = around 0.85</output>

<result>17/20 = around 0.85</result>