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Verified answer
Kelas 7 MatematikaBab Perbandingan dan Aritmatika Sosial
Andika = a
Budiman = b
a = 3b
a = 4 + b
3b - b = 4
2b = 4
b = 4/2
b = 2
a = 3 . b
a = 3 . 2
a = 6
Umur Andika = 6 tahun
Umur Budiman = 2 tahun