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Bab: kesebangunan
Jawab:
misalkan tinggi foto = X
lebar foto = 30-3-3
30-3-3/30 : X/40
=> 24/30 : X/40
=> 24.40 : 30X
=> 960 : 30X
=> 960/30 : X
=> 32 : X
Sisa karton bagian bawah
=> 40-3-32
=> 5 cm