Question

lenght of a triangle is 8m more than its breadth. if the length is increased by 7 m and breadth is decreased by 4m , it's area remains unchanged. find the lenght of the blackboard

Answer 1

Here is ur answer
Breadth =x m
Length =x+8 m
If l is increased by 7
Length =x+15 m
Breadth =x-4
Atq
X(x+8)=x+15(x-4)
X2 +8x =x 2 +15x -4x -60
8x -15x +4x =-60
-3x =-60
X =20
So length = 20+8 = 28 m
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