answer the question i will follow u if u ans.
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Answer:
1620
Step-by-step explanation:
let the common multiple be x .
length = 4x breadth = 5x
we know ,
perimeter of rect = 2( l + b)
= 2 ( 4x + 5x )
= 2 × 9x
= 18x
but perimeter is given = 144
18x = 144
x = 9
l = 4x = 4×9 = 36
b = 5x = 5×9 = 45
area of rect = l × b
= 36 × 45
= 1620
hope it helps
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