Mathematics, 01.04.2020 18:40 ayoismeisalex

John has two colored varieties of water bottles: white water bottles and black water bottles. The total number of water bottles is 20. He sold a white water bottles for 1 and a black water bottles for 2 and earned a sum of 35. Find number of black water bottles he has.

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John has two colored varieties of water bottles: white water bottles and black water bottles. The to...

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