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Mathematics 6 Online
OpenStudy (anonymous):

Four boys Alex, Bryan, Calvin and Derrick each have some stamps. The number of stamps Alex has is ½ of the total number of stamps Bryan, Calvin and Derrick have. The number of stamps Bryan has is 1/3 the total number of stamps Alex ,Calvin and Derrick have. The number of stamps Calvin has is ¼ of the total number of stamps Alex , Bryan and Derrick have. If Derrick has 78 stamps , find the total number of stamps Alex and Bryan have altogether

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