perimeter

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alltimeacheiver: Master | Next Rank: 500 Posts; Posts: 183; Joined: Wed Feb 09, 2011 3:08 amFollowed by: 5 members; Location: Delhi; Thanked: 1 times

by alltimeacheiver » Fri May 13, 2011 4:45 am

area =lxb

here length is twice then breadth. then it will be 4l +2b=permiter

now lxb =128 then the case will be 16+8. From here I am lost. share ur input guys

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Source: Beat The GMAT — Problem Solving | Fri May 13, 2011 4:45 am

djiddish98: Senior | Next Rank: 100 Posts; Posts: 57; Joined: Fri Jan 14, 2011 10:01 am; Thanked: 10 times

by djiddish98 » Fri May 13, 2011 4:54 am

Keep in mind that there's a wall on one of the sides, so we're only dealing with a fence that covers 3 sides.

The question tells us the fence piece opposite the wall is 2 times larger than the other 2 sides. So 2x equals large side, x = short side.

Area = 128 -> (2x)(x) = 128. x = 8.

Therefore the fence perimeter = x + x + 2x or 8+8+16.

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