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[tex]\\ \sf\longmapsto 2(L+B)=55[/tex]
[tex]\\ \sf\longmapsto 2(\dfrac{4}{3}x+x)=55[/tex]
[tex]\\ \sf\longmapsto \dfrac{8}{3}x+2x=55[/tex]
[tex]\\ \sf\longmapsto \dfrac{8x+6x}{3}=55[/tex]
[tex]\\ \sf\longmapsto \dfrac{14x}{3}=55[/tex]
[tex]\\ \sf\longmapsto 14x=165[/tex]
[tex]\\ \sf\longmapsto x=11.78[/tex]
[tex]\\ \sf\longmapsto x\approx 12[/tex]
Now
Step-by-step explanation:
Given,
Length= 4/3 x
Breadth= x
Perimeter=2(l+b)
55=2(4x/3+x)
55=8x/3+2x
55=(8x+6x)/3
55=14x/3
55×3=14x
165=14x
165/14=x
x=11.78
Hence,
Breadth=x=11.78
Length=4x/3=(4×11.78)/3=15.7067