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2 : 3
R = R/(R+F) x buku total
R = 2/(2+3) x 35
R = 2/5 x 35
R = 2 x 7 = 14 buku
F = F/(R+F) x buku total
F = 3/(2+3) x 35
F = 3/5 x 35
F = 3 x 7 = 21 buku