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RE: Brainsteem #10 Prize Mathematics Puzzle [Win 2 SBD and 1 SBD]
From the information provided we can obtain the following equations:-
R / (21+W) + 1/28 = R / 21
W / (W+B) = 1/18 + W / 21
R+W+B = 21
3 equations with 3 unknowns, we can obtain the answer by algebraic manipulation, which is R=3, W=7, B=11.