Cevap:
[tex]\frac{n}{a} = \frac{4}{5}\\\\n = \frac{4}{5}a\\\\\frac{s}{n} = \frac{4}{5}\\\\s = \frac{4}{5}n\\\\s = \frac{4}{5}\frac{4}{5}a\\\\s = \frac{16}{25}a\\\\[/tex]
[tex]a - s = 54\\\\a - \frac{16}{25}a = 54\\\\\frac{9}{25}a = 54\\\\a = 150\\[/tex]
[tex]n = \frac{4}{5}a\\\\n = \frac{4}{5}150cm\\\\n = 120cm[/tex]