Two boxes of apples weigh 90 kg in total. After taking one fifth of them out of the first box, the two boxes are equal in weight. How many kg does the first box weigh? Seek truth!

If the weight of the first container is x, then it is 4 / 5x after 1 / 5 is taken out. At this time, the two containers are of equal weight, so x + 4 / 5x = 90,
So x = 50kg, the second box weighs 40kg

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