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3 : 1
4 buku +3 pensil= 24000
4x3+3=24000
15=24000
1=24000:15= 1600
1 pensil 1600
1 buku = 1600x 3=4800
3buku + 1 pensil = 3x4800+1600= 16000
4b + 3p = 24.000
4(3p) + 3p = 24.000
12p + 3p = 24.000
15p= 24.000
p = 24.000 : 15
p = 1.600
Jadi 1b = 3p
1b = 3 x 1.600
1b = 4.800
Jadi, jika Andi membeli 3 buku dan 1 pensil :
3b + 1p = (3 x 4.800) + 1.600
= 14.400 + 1.600
= 16.000
Semoga bisa membantu, maaf kalo salah.