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= 30 cm
t.foto = 60 - 5 - x
= 55 - x
l.foto : l.karton = t.foto : t.karrton
30 : 40 = (55 - x) : 60
40 .(55 - x) = 30 . 60
2200 - 40x = 1800
- 40x = 1800 - 2200
- 40x = - 400
x = - 400/- 40
x = 10 cm
jadi,lebar karton di sebelah bawah = 10 cm