Dad uses 300 kg rapeseed mustard oil and 120 kg. What is the oil yield of rapeseed?
爸爸用300千克油菜子榨菜油120千克，菜子的出油率是多少．
<gadget id="calculator">120 / 300</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>