Question

the length of a rectangle is three times its breadth ,,, perimeter is 56m . the length is

Answer 1

Let breadth be x
Length=3x
ATP
2 (3x+x)=56 m
6x+2x=56 m
8x=56 m
x=7
Breadth=7 m
Length=3x=3*7=21m

Answer 2

Let breadth be - 'x'

(according to the question)  

Length = 3 times of breadth = 3x  

perimeter =56m  

=perimeter = 2(length + breadth)

=56=2(3x+x)

=56=2(4x)

=56=8x

=56/8=x

=7=x

so breadth = x=7m

and length = 3x = 3 X 7 =21m

CHECK  

perimeter = 2(length+ breadth )

= 2(21+7)

=2 X 28

= 56