Two alloys of aluminum have different percentages of aluminum in them. The first one weighs 8 kg and the second one weighs 16 kg. one piece each of equal weight was cut of from both the alloys and first piece was alloyed with the second alloy and the second piece alloyed with the first one. As a result, the percentage of aluminum became the same in the resulting tow new alloys. What was the weight of each cut-off piece? with proper explaination

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