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A = 1/15 x 30 = 2 tahun
B = 4/15 x 30 = 8 tahun
C = 10/15 x 30 = 20 tahun
Umur b:c = 2:5
Umur a:b:c = 1:4:10
Jumlah umur =30
Umur a= 1/15 x 30
=2
Umur b= 4/10 x 30
=8
Umur c= 10/15 x 30
=20