BTGmoderatorDC wrote:
The figure above represents a rectangular garden bordered by a walkaway that has a uniform width of 3 feet. What's the perimeter of the garden?
(1) The outer perimeter of the walkway is 124 feet
(2) The area of the garden is 600 feet.
OA
A
Source: GMAT Prep
Say the length of the garden is a feet and breadth is b feet; thus, the length of the outer walkway = a + 3 and the breadth of the outer walkway = b + 3.
We have to get the value of 2(a + b).
Let's take each statement one by one.
(1) The outer perimeter of the walkway is 124 feet.
2[(a + 3) +(b + 3)] = 124 => [(a + 3) +(b + 3)] = 62 => a + b = 56. Sufficient.
(2) The area of the garden is 600 feet.
ab = 600. We cannot find the unique value of (a + b). Insufficient.
The correct answer:
A
Hope this helps!
-Jay
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