Question

The length of a rectangle is 12 em less than five times its breadth. The length is 78cm​

Answer 1

Answer:

let, the breadth =x

the length =5x-12=78cm

5x-12=78

5x=78+12

5x=90

x=90/5

x=18

breadth = 18cm

area=lb=78*18=1,404cm²

perimeter =2(l+b) =2(78+18)=2(96)=192cm

I hope my answer helps you ☺☺

Answer 2

Solution

Step by step Explanation:

Given:

Length of Rectangle which is 78cm

Let the breadth of Rectangle be 'x'

According to Question=>

5times of breadth be 5x

Now ,length is 12 less than 5 times it's breadth =>5x-12

We obtain equation of length,now equate with given value e.g ,78

$\longmapsto5x - 12 = 78$

$\longmapsto5x = 90$

$\longmapsto \: x = \dfrac{90}{5} = 18$

We obtain x=18 cm

Therefore,breadth is 18 cm

Check :

Length is 12 less than 5 times of Breadth

$5 \times 18 = 90 - 12 = 78$

Extra shot =>

Area of Rectangle=$\sf length \times breadth$

$\sf= 78 \times 18 = \bold{1404 {cm}^{2}}$

Perimeter of Rectangle=2(length+breadth)

$= 2(78 + 18) = 96 \times 2 =\bold{19 2cm}$