tolong Bantu Saya Plis Di Jawab Soal No 3-5 pake cara yaa.....

3. l = 2/3 p
K = (l + p) x 2
240 = (l + p) x 2
120 = l + p
120 = 2/3 p + 3/3 p
120 = 5/3 p
p = 120 : 5/3
p = 120 x 3/5
p = 72 m
l = 2/3 p = 2/3 x 72 = 48 m
L = 72 x 48 = 3456 m²