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the length of a plot is four times its breadth if the perimeter is 150m find the dimension of the plot

Let  breadth be x and length be 4x.
Perimeter= 150m
2(l+b)=150
2(x+4x)=150
5x=75
x=15m
4x=60m
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Breadth = y
Length =4 y
P = 2(l+b) = 150
   = 2(4y + y) = 150
   = 2( 5y) = 150
   = 5y = 150/2
   = 5y = 75
    = y = 75/5 = 15
BREADTH = 15 CM
LENGTH = 4 x BREADTH
                = 4 x 15
                = 60 cm
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