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b : c = 2 : 5
a : b : c = (1.2) : (2.4) : (4.5)
= 2 : 8 : 20
= 1 : 4 : 10
a = 1/1+4+10 × 30
= 1/15 × 30 = 2 tahun
b = 4/1+4+10 × 30
= 4/15 × 30 = 8 tahun
c = 10/1+4+10 × 30
= 10/15 × 30 = 20 tahun
B : C = 2 : 5 ( kali 2 ) = 4 : 10
Perbandingan mnjd 1 : 4 : 10
A = 1/15 x 30 = 2
B = 4/15 x 30 = 8
C = 10/15 x 30 = 20