A barrel of oil is poured out in two parts. The whole (1/4) is poured out for the first time, and 75 kg more than the first time is poured out for the second time, how many kilograms are poured out for the first time?
一桶油，分两次倒完．第一次倒出全部的(1/4)，第二次比第一次多倒出75千克，求第一次倒出多少千克？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">75 / (1/2)</gadget>
<output>150</output>

<gadget id="calculator">150 * (1/4)</gadget>
<output>75/2 = around 37.5</output>

<result>75/2 = around 37.5</result>