Question

Breadth of a lunch box is 15 cm and its length is twice its breadth what will be the perimeter of the lunch box​

Answer 1

${\huge{\bold{\underline{Question:-}}}}$

Breadth of a lunch box is 15 cm and its length is twice its breadth what will be the perimeter of the lunch box

${\huge{\bold{\underline{Answer:-}}}}$

Let width of rectangle be W

∴  length would be  L=2W−5 

If the length is decreased by 5cm, then new L1=2W−10cm  

and width is increased by 2cm, new width W1=W+2cm 

Given, Perimeter =74cm

=>2(2W−10+W+2)=74

=>3W−8=37

=>3W=45

=>W=15cm

=>L=2W−5=2(15)−5=25cm

Answer 2

Answer:

shape of lunch box=rectangle

perimeter of rectangle=2(l+b)

breadth=15cm

length=15×2=30cm

perimeter=2(30+15)

=2(45)

90cm