There are two barrels of oil, A and B. There is 45 kg of oil in the barrel of A, and 24 kg of oil in the barrel of B. How many kilograms of oil are poured from barrel A to barrel B so that the weight of oil in barrel A is equal to the weight of oil in barrel B?
有甲、乙两桶油，甲桶里有油45千克，乙桶里有油24千克．从甲桶中倒出多少千克油给乙桶，才能使甲桶里的油的重量等于乙桶里油的重量？
<gadget id="calculator">45 + 24</gadget>
<output>69</output>

<gadget id="calculator">69 / 2</gadget>
<output>69/2 = around 34.5</output>

<gadget id="calculator">45 - (69/2)</gadget>
<output>21/2 = around 10.5</output>

<result>21/2 = around 10.5</result>