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andi = a
r : a
4 : 2
selisih = 12
r = 4/(4-2) x 12 = 4/2 x 12 = 2 x 12 = 24 buku
a = 2 /(4-2) x 12 = 2/2 x 12 = 1 x 12 = 12 buku
jumlah = 24 + 12 = 36 buku
Selisih perbandingan = 4 - 2 = 2
Selisih Buku Keduanya = 12
Maka;
Buku Rizki = 4/2 x 12 = 24 buku
Buku Andi = 2/2 x 12 = 12 buku
Jadi, jumlah buku mereka = 24 buku + 12 buku = 36 buku