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12. If the length of a rectangle is 4 times the breadth and perimeter is 200 cm, find the lengthand breadth of the rectangle. |
| Answer» LET the breadth of the rectangle be x cm.Then, length = 3x cmNew breadth =(x+5) cmNew length =(3x−3)CMTHEN, (x+5)(3x−3)−3x×x=57⇒3x 2 +12x−15−3x 2 =57⇒12x=57+15=72⇒x=6∴ Breadth = 6 cm, Length = 18 cmPerimeter =2(6cm+18cm)=2×24cm=48 cmHOPE IT'S HELP YOU....MARK ME A BRAIN LIST........ | |