barrel originally contained some gasoline. If 25.8kg is poured in first, then 47.6kg is poured out, exactly 100kg of gasoline is left. If 25.8kg is poured out first, and then 47.6kg is poured in, how many kilograms of gasoline are left in the barrel?
一个油桶原来装了一些汽油，如果先倒入25.8kg，再倒出47.6kg，恰好剩100kg汽油，如果先倒出25.8kg，再倒入47.6kg，桶里还剩多少千克汽油？
<gadget id="calculator">100 - 25.8</gadget>
<output>74.2</output>

<gadget id="calculator">74.2 + 47.6</gadget>
<output>121.8</output>

<gadget id="calculator">121.8 - 25.8</gadget>
<output>96</output>

<gadget id="calculator">96 + 47.6</gadget>
<output>143.6</output>

<result>143.6</result>