the lenght of rectangle is 5 m less then thrice its breadth, find its length if its breadth is X m?​

1 thought on “the lenght of rectangle is 5 m less then thrice its breadth, find its length if its breadth is X m?​”

1. Answer:

   Let the breadth of a rectangle be x cm.

   Therefore, length will be 2x−5 cm.

   Now, length is decreased by 5 cm i.e., 2x−5−5=2x−10 cm and breadth is increased by 2 cm, i.e., x+2 cm.

   Also given, perimeter =74=2(l+b) cm.

   Therefore, 2[2x−10+x+2]=74

   ⇒2[3x−8]=74

   ⇒6x−16=74

   ⇒6x=74+16

   ⇒6x=90

   ⇒x=15

   Now, length will be =2x−5=2(15)−5=30−5=25 cm.

   Therefore, length and breadth of a rectangle are 25 cm and 15 cm respectively.

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