There is a barrel of oil weighing 100 kilograms, 10% of the total is taken out for the first time, and 11% of the total is taken out for the second time, how many kilograms of oil are left in the barrel?
有一桶油，重100千克，第一次取出总数的10%，第二次取出总数的11%，这桶油还剩多少千克？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">11 / 100</gadget>
<output>11/100 = around 0.11</output>

<gadget id="calculator">1 - (1/10) - (11/100)</gadget>
<output>79/100 = around 0.79</output>

<gadget id="calculator">100 * (79/100)</gadget>
<output>79</output>

<result>79</result>