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B : C = 2 : 3
B = 2/(2+3) .100
=2/5 . 100
= 40
A : B = 3 : 4
A : B = x : 40
x= 3 . 40 / 4
x = 30
A + B = 30 + 40
= 70
B : C = 2 : 3
A : B : C = 3 : 4 : 6
A + B = (3+4)/(4+6) x 100
A + B = 7/10 x 100
A + B = 70