CBSE Class 10 Answered
plz solve Red tick marked question urgently dear experts :
Asked by savitamahajan202 | 24 Jan, 2023, 12:09: PM
Expert Answer
Let l be length and b be breadth of rectangle.
Perimeter of rectangle = 2 ( l + b )= 240 cm
l + b = 120 cm .............................................. (1)
if length decreased by 10% , then changed length = 0.9 l
if breadth increased by 20% , then changed breadth = 1.2 b
new perimeter = 2 ( 0.9 l + 1.2 b ) = 240 cm
( 0.9 l + 1.2 b ) = 120 cm
9l + 12 b = 1200 ......................................(2)
let us eliminate l using eqn.(1) and rewrite above equation as
9( 120 - b ) + 12 b = 1200
1080 + 3b = 1200
3b = 120 or b = 40 cm
from eqn.(1) , we get l+40 = 120 ; hence l = 80 cm
Length of rectangle = 80 cm
Breadth of rectangle = 40 cm
Answered by Thiyagarajan K | 24 Jan, 2023, 01:11: PM
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