200 kg of oil can be extracted from 500 kg of peanut kernels. What is the oil yield of this kind of peanut kernels?
用500千克花生仁能榨出200千克的油，这种花生仁的出油率是多少？
<gadget id="calculator">200 / 500</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(2/5) * 1</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>