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Four brothers went camping. The eldest brother divided the equipment between them so that the elder brothers would carry heavier load than the younger

ones. The heaviest backpack weighed 20,5 kg, the next 5,5kg less and so on. What was the overall weight of their backpacks?


20,5 kg - the 1st brother
20,5-5,5=15 kg - the 2nd brother
15-5,5=9,5 kg - the 3rd brother
9,5-5,5=4 kg - the 4th brother

20,5+15+9,5+4=49 kg
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