The ratio between the perimeter and the breadth of a rectangle is 7 : 3. If the area of the rectangle is 192 sq. cm, what is the length of the rectangle?
A)15 cm B)18 cm C)12 cm D)16 cm E)Data inadequate

• perimeter:breadth=7:3
  2(l+b):b =7:3
  2(l+b)/b = 7/3;
  6l+ 6b=7b
  6l=b
  area=192
  l*b=192
  l*6l=192
  6 l^2=192
  l^2=32
  l=sqrt(32)
  l=5.656
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