There are two buckets, A and B, containing sugar water. Bucket A contains 60 kg of sugar water with a sugar content of 4%, and bucket B contains 40 kg of sugar water with a sugar content of 20%. How many kilograms must be exchanged between the two barrels to make the sugar content of the two barrels of sugar water equal.
甲、乙两只装有糖水的桶，甲桶有糖水60千克，含糖率4%，乙桶有糖水40千克，含糖率为20%．两桶互相交换多少千克才能使两桶糖水的含糖率相等．
<gadget id="calculator">24 - 4.8</gadget>
<output>19.2</output>

<gadget id="calculator">0.32 + 0.48</gadget>
<output>0.8</output>

<gadget id="calculator">19.2 / 0.8</gadget>
<output>24</output>

<result>24</result>