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Lebar foto = 18 - 5 - 5 = 8 cm
Panjang karton = 24 cm
Panjang foto = 24 - 5 - x = 19 - x (dimana x adalah sisa kertas bawah)
8 : 18 = 19-x : 24
18 (19-x) = 24.8
19-x = 24.8/18
19-x = 10,67
19-10,67 = x
x = 8,333 = 8 1/3 (D)