Mathematics, 22.07.2019 13:30 lillygon81

Bria and matt have a total of 400 stamps. matt has three times as many stamps as bria. which system of equations can be used to find the number of stamps bria has, b, and the number of stamps matt has, m?

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Bria and matt have a total of 400 stamps. matt has three times as many stamps as bria. which system...