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C=3x18=54
A=(36/4)x3=27
jadi, jumlah semua buku 27+36+54=117 buah
B:C=2:3
A:B:C= 3:4:6
selisih b dan c= 6-4 = 2
jumlah perbandingan= 3+4+6 =13
jumlah buku seluruhnya= 13/2 x 18
=117 buah buku
maaf klo salah