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lebar karton = 20 cm
panjang karton = 30 cm
lebar foto = 20 - 2(3)
= 20 - 6
= 14 cm
panjang foto = x
lebar karton / lebar foto = panjang karton / panjang foto
20 / 14 = 30 / x
20x = (14)(30)
20x = 420
x = 420 / 20
x = 21 cm
sisa bawah :
30 - 21 - 3
= 6 cm