There is a barrel of oil, 20% of the full barrel of oil is taken out for the first time, and 5 kg less than the first time is taken out for the second time, leaving 53 kg, how many kilograms are there?
有一桶油，第一次取出全桶油的20%，第二次比第一次少取5千克，还剩下53千克，求原来有多少千克？
<gadget id="calculator">53 - 5</gadget>
<output>48</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">48 / (3/5)</gadget>
<output>80</output>

<result>80</result>