A barrel of oil, including the barrels, weighs 76 kg in total. After (2/3) of the oil is used, the total weight of the barrels is 26 kg. How many kilograms of oil are there in the barrel?
一桶油，连桶共重76千克，用去(2/3)的油以后，连桶共重26千克．原来桶中的油有多少千克？
<gadget id="calculator">76 - 26</gadget>
<output>50</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">50 / (2/3)</gadget>
<output>75</output>

<result>75</result>