Question

Find the lenght of a rectangle, if it is 3 times its breadth and its perimeter 40 cm​

Answer 1

Answer:

Length is 15 cm.

Step-by-step explanation:

Let B be x. L will be 3x.

Perimeter = 40 cm

=> 2(L+B) = 40 cm

=> 2 * 4x = 40 cm

=> 8x = 40 cm

=> x = 5 cm

Length = 3x = 5*3 cm = 15 cm

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Answer 2

Step-by-step explanation:

Let l and b be the length and breadth of rectangle

Given that, l=3b

We know that,

Perimeter of the rectangle =2×(l+b)

⇒40 cm=2×(3b+b)=2×4 b=8 b

⇒b=

8

40

cm=5 cm

⇒l=3b=3×5 cm=15 cm.

Hence, the length and width of the rectangle are 15 cm and 5 cm% respectively.