100 kg of peanuts can extract 42 kg of oil, find the oil rate. If 250,000 tons of peanuts are used, how many tons of oil can be extracted?
100千克的花生可以榨油42千克，求出油率．如果用25万吨的花生，可以榨油多少万吨？
<gadget id="calculator">42 / 100</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>

<gadget id="calculator">25 * (21/50)</gadget>
<output>21/2 = around 10.5</output>

<result>21/2 = around 10.5</result>