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7+3 10
Ensiklopedia = 3 = 3 x 80 = 24
7+3 10
Selisih = 56 - 24 = 32
buku ensiklopedia = 3/10x80
= 24 buku
buku dongeng = 7/10x80
=56 buku
Selisih = 56-24 = 32 buku