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t:f:c = 5:4:6
f = 4/15 x
C = 6/15 x
c= f+4
6/15x = 4/15x +4
6/15x -4/15x =4
2/15x = 4
x = 15/2 kali 4
x = 30
jadi jumlah usia mereka bertiga 30th