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A a B b C c D
a + b + b + c = 24
a + b + c = 24 - b
b = 3x/5
5b = 3x
5b = 3(a + b + c)
5b = 3(24 - b)
5b = 72 - 3b
8b = 72
b = 9
a + b + c = x = 24 - b = 24 - 9 = 15