Question

the perimeter of a rectangle is 40m. the length is 4m less than 5 times it's breadth. find the length
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Answer 1

Answer:

2[x+(5x-4)]=40

or,2x+10x-8=40

or,12x=48

or,x=4

Breadth=4 cm, lenth=16 cm

Answer 2

Answer:

Length is 15 m and Breadth is 5 m

Step-by-step explanation:

Length = 5 - 4x

Breadth = x

Perimeter = 2 (l+b)

40 = 2 (5 - 4x + x)

40 = 2 (5 - 3x)

20 = 5 - 3x

3x = 15

x = 5

Length = 5 - 4(5) = -15 m

Length cant be negative

= 15 m

Breadth = x = 5 m