Question

the length of a rectangle is twice its breadth . What is the length ,if
perimeter is 90 cm?​

Answer 1

Answer:

Correct answer is 30cm

Step-by-step explanation:

Let the breadth be x.

length = 2x

According to question,

Perimeter of rectangle= 2( l+b )

90 = 2( 2x+x )

90 = 4x+2x

90 = 6x

90/6 = x

15 = x

Hence, breadth = 15cm

So, length = 15×2 = 30cm

Answer 2

Answer :-

• Length of the rectangle is 30cm.

Given :-

• The length of a rectangle is twice its breadth. Perimeter of the rectangle is 90cm.

To Find :-

• Length of the rectangle.

Solution :-

Let

• Breadth of the rectangle be x
• Length of the rectangle will be 2x

Here

• Perimeter of the rectangle is 90cm

As we know that

Perimeter of the rectangle is 2 (l + b)

Where

• l = length
• b = breadth

According to question :-

2 (2x + x) = 90

⇒ 2x + x = 90/2

⇒ 3x = 45

⇒ x = 45/3

⇒ x = 15

• Breadth = x = 15cm
• Length = 2x = 2 × 15 = 30cm