The length of rectangular wooden ply is twice its breadth If its length is increased by 10m The area...........

Quantitative Aptitude (CDS) Mensuration 2D

The length of rectangular wooden ply is twice its breadth.If its length is increased by 10m.The area of wooden ply is increased by 240 m2. Find the length of the wooden ply?

10/15 m

11/40 m

28/3 m

3/28

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Explanation:

Let length is l and breadth is b
l= 2b
New length and breadth is l+10 and breadth is l/2 +10
Area is=l× b
New area is =(l+10) (l/2 +10)
l×b +240 =(l+10) (l/2 +10)
2(l×l/2 +240) =l^2 +30 l + 200
30 l=480-200
l=280/30
l= 28/3 m