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p:l:t = 8:3:2
maka
p = 8x
l = 3x
t = 2x
panjang rusuk = 4(p+l+t)
350 = 4(8x+3x+2x)
350 = 4(13x)
350 = 52x ⇒ x harus bilangan bulat (tidak boleh desimal)
x = 6 sisa 38
jadi panjang kawat yang tersisa adalah 38 cm