500 kg of rapeseed can extract 210 kg of oil, what is the oil yield of this batch of rapeseed?
500千克菜籽能榨出油210千克，这批菜籽的出油率是多少．
<gadget id="calculator">210 / 500</gadget>
<output>21/50 = around 0.42</output>

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

<gadget id="calculator">(21/50) * 1</gadget>
<output>21/50 = around 0.42</output>

<result>21/50 = around 0.42</result>