A barrel of oil weighs 150kg when it is full, and after (2/5) is used up, the barrel of oil still weighs 92kg. How many kilograms does this oil barrel weigh?
一桶油装满后连桶重150kg，用去(2/5)后，这桶油连桶还重92kg，这只油桶重多少千克？
<gadget id="calculator">150 - 92</gadget>
<output>58</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">58 / (2/5)</gadget>
<output>145</output>

<gadget id="calculator">150 - 145</gadget>
<output>5</output>

<result>5</result>