Question

the length of the rectangle is 7 cm more than its breadth if the perimeter of the rectangle is 90 cm find its width and length

Answer 1

let the breadth be x then the lenght will be x+7

perimeter=2(l+b)

perimeter=2(x+x+7)

perimeter=2(2x+7)

perimeter=4x+14

90=4x+14

90-14=4x

76=4x

76/4=x

19=x

then lenght =19+7=26 and breadth =x=19


I hope this will help you

Answer 2

Let the breadth be x cm

length = x + 7 cm


Perimeter = 2( length + breadth )

$90 = 2(x + 7 + x)$

$90 = 2(2x + 7)$

$\frac{90}{2} = 2x + 7$

$45 = 2x + 7$

$45 - 7 = 2x$

$38 = 2x$

$x = \frac{38}{2}$

$x = 19$


so,

length = x + 7 = 19 + 7 = 26cm

breadth = x = 19cm