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p. karton = 45
l. foto = 40 - 2 - 2 = 36
p. foto = 45 - 2 = 43 - x
lebar karton diatas foto = ..........???
p.foto = l. foto
p. karton l. karton
43 - x = 36
45 40
40(43 - x) = 36.45
1720 - 40x = 1620
-40x = 1620 - 1720
-40x = -100
x = -100/-40
x = 25
jadi lebar karton diatas foto adalah 2,5 cm (C)