Question

The perimeter of a rectangle is 520 m if the breadth of the ractangle is 40 m . Find its length and area

Answer 1

$perimeter = 2(l + b) \\ 520 = 2(l + 40) \\ 520 \div 2 = l + 40 \\ 260 = l+ 40 \\ 260 - 40 = l \\ 220m = l$
area of rectangle
$l \times b \\ 220 \times 40 = 8800 {m}^{2}$