No.14 ya pake cara nya thankyou!

p : l = 2 : 5
Misal :
p = 2x
l = 5x

L. persegi panjang = 40 cm²
p x l = 40
(2x) (5x) = 40
10x² = 40
x² = 40/10
x² = 4
x = √4
x = 2 cm

Lebar persegi panjang
= 5x
= 5 (2)
= 10 cm