Question

Lèngth of rectangle is 4 m less than 3 times its bredth . If the perimeter is 32 find l and b

Answer 1

Step-by-step explanation:

Let the breadth of rectangle be x m

then the length becomes 3x-4 m

since, perimeter =2(l+b)

therefore, 32=2(x+3x-4)

16=4x-4

4x=20

x=5 m

therefore, breadth =5m and length=3×5-4=11m

Answer 2

Answer:

Let the breadth of rectangle be b.

Then its length will be = 3b - 4.

Perimeter of rectangle = 2 ( l + b)

$32 = 2 (3b - 4 + b) \\ \\ \frac{32}{2} = 4b - 4 \\ \\ 16 = 4b - 4 \\ \\ 20 = 4b \\ \\ b = \frac{20}{4} \\ b = 5 \: m$

Length = 3b - 4

= 3 (5) - 4

= 15 -4

= 11m

Hope it helps.