The oil yield rate of rapeseed is 42%, how many kilograms of oil can be extracted from 250 kg of rapeseed.
油菜籽的出油率为42%，250千克油菜籽可榨油多少千克．
<gadget id="calculator">42 / 100</gadget>
<output>21/50 = around 0.42</output>

<gadget id="calculator">250 * (21/50)</gadget>
<output>105</output>

<result>105</result>