Question

convert the following statement into equation using 'a' as variable the length of a rectangle is 5 more than its breadth its perimeter is 40cm

Answer 1

Let the breadth of the rectangle, b = a cm

length , l = (a+5) cm

perimeter = 40 cm

=> 2(l+b) = 40

=> 2(a+5 + a) = 40

=> 2(2a + 5) = 40

=> 2a + 5 = 40/2

=> 2a + 5 = 20

=> 2a +5 - 20 = 0

=> 2a - 15 = 0

Required equation: 2a - 15 = 0

Answer 2

Answer:

2a - 15 = 0

Step-by-step explanation:

Let the breadth of rectangle = a cm

(It is given, length of rectangle is 5 more than its breadth)

=> Length = (a + 5) cm

=> Perimeter = 40 cm

Now, we know that perimeter of rectangle = 2(l+ b)

=> 2(l+ b) = 40

Putting the values of length and breadth

=> 2(a + 5+ a) = 40

=> 2(2a + 5) = 40

=> 2a + 5 = 40/2

=> 2a + 5 = 20

=> 2a = 20 - 5

=> 2a = 15 or 2a - 15 = 0