Question

If the length and breadth of a room are increased by 1m . The area of the room increased by 21 sq m . If the length is increased by 1m and breadth is decreased by 1m the area is decreased by 5 sq m . Find the perimeter of the room

Answer 1

Answer:

P = 40 m

Step-by-step explanation:

Information from fist part is more than enough for this question.

( l + 1)(w + 1) = lw + 21

lw + l + w + 1 = lw + 21

l + w = 20

P = 2(l + w) = 2×20 = 40 m