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P = 1/3 .B ⇒ 3P = B
2.P + 3.B = 33.000
2.P + 3.(3P) = 33.000
2.P + 9.P = 33.000
11.P = 33.000
P = 33.000 / 11
P = 3.000
B = 3.P
= 3 .(3000)
= 9.000
jadi, harga 1 pensil = 3.000
harga 1 buku = 9.000
harga 1 pensil dan 1 buku = 3.000 + 9.000
= 12.000