Question

if the length and breadth of a rectangle are doubled, the ratio of the new perimeter to the original perimeter will be​

Answer 1

Orig perimeter = 2(l+b)

New perimeter = 2(2l+ 2b) = 4( l+b)

New per. / orig. Peri = 4(l+b)/2l+b)

= 2/1 = 2:1