There is a barrel of oil, pour it out (2/5) for the first time, then pour 60 kg back into the barrel, pour out the oil in the barrel (3/8) for the second time, pour out 130 kg for the third time, just use it up , how many kilograms is this barrel of oil?
有一桶油，第一次倒出它的(2/5)，然后倒回桶内60千克，第二次倒出桶中油的(3/8)，第三次倒出130千克，正好用完，求原来这桶油有多少千克？
<gadget id="calculator">216 - 60</gadget>
<output>156</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">156 * (5/2)</gadget>
<output>390</output>

<result>390</result>