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100 : ( 2 + 3 ) = 20
Nilai B :
20 × 2 = 40
Nilai C :
20 × 3 = 60
Cari nilai A dengan B = 40 :
A : B = 3 : 4
A : 40 = 3 : 4
A = 40 × 3 : 4
A = 30
Maka, nilai A + B :
A + B = 30 + 40
= 70
B=8
C=12
14/20 X 100 =70