Take 400 grams of wheat, after drying, there are still 320 grams, what is the moisture content of this wheat.
取400克小麦，烘干后，还有320克，这种小麦的含水率是多少．
<gadget id="calculator">400 - 320</gadget>
<output>80</output>

<gadget id="calculator">80 / 400</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) * 1</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>