A bag of wheat is ground to yield 80 kg of flour and 20 kg of bran. Powder yield?
一袋小麦共磨出面粉80千克，出麸皮20千克．出粉率？
<gadget id="calculator">80 + 20</gadget>
<output>100</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) * 1</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>