For a barrel of oil, 37.5% is poured out for the first time, and the rest (2/5) is poured out for the second time. At this time, there are still 45 kilograms left. How many kilograms is this barrel of oil originally?
一桶油，第一次倒出37.5%，第二次倒出剩下的(2/5)，这时还剩下45千克，这桶油原来有多少千克？
<gadget id="calculator">62.5 / 100</gadget>
<output>0.625</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">0.625 - (1/4)</gadget>
<output>0.375</output>

<gadget id="calculator">45 / 0.375</gadget>
<output>120</output>

<result>120</result>