The oil yield of a kind of peanut kernel is about 42%. To extract 630 kilograms of oil, how many kilograms of this kind of peanut kernel are needed?
一种花生仁的出油率约是42%，要榨630千克的油，需要这种花生仁多少千克？
<gadget id="calculator">42 / 100</gadget>
<output>21/50 = around 0.42</output>

<gadget id="calculator">630 / (21/50)</gadget>
<output>1_500</output>

<result>1_500</result>