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Verified answer
A - 5 = 3(B - 5)A - 3B = -15 + 5
A - 3B = -10 ... (1)
A = 2B ... (2)
A - 3B = -10
2B - 3B = -10
-B = -10
B = 10
A = 2B = 20
Umur sekarang
A = Andi = 20 tahun
B = Bidi = 10 tahun
5 tahun yg akan datang, jumlah umur mreka
= (A + 5) + (B + 5)
= 40