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4x + 10 = 70
4x = 60
x = 15
lebar = x = 15
panjang = x + 5 = 20
luas = 15 . 20 = 300 m2
K = 2 {(l+5) + l}
70 = 2 (2l+5)
70 = 4l + 10
60 = 4l
l = 60/4
l = 15 m, p = 5+l=20 m
L = p x l
= 20 x 15
= 300