After drying 800 grams of wheat, there are still 680 grams. What is the moisture content of this wheat?
将800克小麦烘干后还有680克，这种小麦的含水率是多少．
<gadget id="calculator">800 - 680</gadget>
<output>120</output>

<gadget id="calculator">120 / 800</gadget>
<output>3/20 = around 0.15</output>

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

<gadget id="calculator">(3/20) * 1</gadget>
<output>3/20 = around 0.15</output>

<result>3/20 = around 0.15</result>