a+a=b+b+b,a+c+b+c=80,b+b+b=c+c+c+c,a=?,b=?,c=?
a=30 b=20 c=15
If a + B + C = 80, a: B: C, then a = (), B = (), C_ =( )
If a + B + C = 80, a: B: C = 5:7:4, then a = (), B = (), C_ =( )
25 35 20
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