Question

the perimeter of a rectangular floor is 40 m and it is 8 m board find its area
.


plz do fast​

Answer 1

rectangle is x, then 5x−4 be the length of the rectangle.
Perimeter of rectangle =2(l+b)
⇒40=2(l+b)
⇒40=2(5x−4+x)
⇒40=12x−8
⇒12x=40+8
⇒12x=48
⇒x=
12
48
​

⇒x=4
Breadth =4 meters
Hence, length =5×4−4=20−4=16m
Therefore, area of rectangle =lb=16×4=64m