Question

When 5 is subtracted from length and breadth of the rectangle, the perimeter becomes 26.' What is the mathematical form of the statement ? Choose the correct alternative answer for the question.
(A) x-y=8
(B) x+y=8
(C) x+y=23
(D) 2x+y=21

Answer 1

Answer:

perimeter=2(l+b)

26. =2(l-5+b-5)

26. =2(l+b-10)

26=2l+2b-20

2l+2b=46

l+b=23

option c

Answer 2

Answer is C

And here I am giving the solution also for better knowledge and understanding.

length and breadth are x and y respectively.

length = x - 5 and breadth = y - 5  

Perimeter formula  = 2(l+b)

⇒2 (x-5 + y - 5 ) = 26

⇒(x+y-10) = 26/2

⇒ x +y - 10 = 13

⇒x+y = 13 + 10

⇒ x + y = 23  (Answer)

That's it friend !!!!!!

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