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Lebar karton = 80cm
Panjang foto = 60-6-6=48cm
Lebar foto = x
Gunakan perbandingan
Pk / Pl= Lk/Ll
60/48 = 80/ x
X = 48 x 80 / 60
X= 3840/60
X= 64
Maka lebar foto = 80-64-6
=10cm