Question

The the perimeter of a rectangle is 300 cM if the length is increased by 20% and the breadth is decreased by 30% we get the same perimeter then the length and breadth are respectively

Answer 1

Answer:

60 & 90 cm

Step-by-step explanation:

Let say L & B are length and breadth respectively

2(L+B) = 300

L+B = 150

New L = L + (30/100)L = 1.3L

New B = B -(20/100)B = 0.8B

2 (1.3L + 0.8B) = 300

1.3L + 0.8B = 150

L + B = 1.3L + 0.8B

0.2 B = 0.3L

B = 1.5L

L + 1.5L = 150

2.5L = 150

L = 60

B = 1.5L = 1.5*60 = 90