Question

21. The length of a rectangle is 15 more than its breadth. If the perimeter of rectangle is
60m find its dimensions​

Answer 1

HELLO FRIENDS

============================================

$\huge\boxed{\underline{\bf{ANSWER}}}$

Let the breadth=x

    the length  =x+15

given perimeter= 150

we know 

Perimeter of rectangle = 2(l+b)

                          150 = 2( x+ x+15)

                           75 = 2x +15

                            60 = 2x

                             30=x 

therefore breadth = 30 cm 

              length   = 30 +15  = 45 cm

check 

150 = 2( 45+30)

150 = 2(75)

150 = 150 

LHS=RHS

hence prooved

Answer 2

☆Solution :

☆ Let breadth be = x

$\implies$ length = 15 + x

Perimeter = 60 m

$\boxed{ \large \red{perimeter} \: = \purple{2(l + b)}}$

$\implies$ 60 m = 2 ( x + 15 + x )

$\implies \: \large \frac{60}{2} \small = 2x + 15$

$\implies$ 30 = 2x + 15

$\implies$ 30 - 15 = 2x

$\implies$ 15 = 2x

$\implies \: x = \large \frac{15}{2}$

$\therefore$ x = 7.5

$\bigstar$ breadth = 7.5m

$\bigstar$ length = x + 15

= 7.5 + 15

$\bigstar$ length =22.5 m