Yang Nomer 11,gampang kok

120=4(p+l+t)
120=4(5+3+2)
120=4(10x)
120=40x
x=120/40
x=3 cm

5x=5×3=15
3x=3×3=9
2x=2×3=6

semoga membantu

p= 5x l= 3x. t= 2x
4 (P+L+t) =
4(5x + 3x + 2x ) = 120
4 (10) =120
x = 120/40 = 3
x = 3
jadi
P =5x3 = 15
l = 3x3 = 9
t = 2x 3 = 6
jawabannya 15 , 9 , dan 6