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Garden

This topic has 2 member replies
grandh01 Master | Next Rank: 500 Posts Default Avatar
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Garden

Post Sun Aug 12, 2012 6:57 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    The length of the edging that
    surrounds circular garden K is
    1/2 the length of the edging that surrounds
    circular garden G. What is the area of
    garden K ? (Assume that the edging
    has negligible width.)
    (1) The area of G is 25π square
    meters.
    (2) The edging around G is 10π
    meters long.

    OA is D

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    theCEO Master | Next Rank: 500 Posts Default Avatar
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    Post Sun Aug 12, 2012 7:02 pm
    Perimeter k = 1/2 perimeter G

    perimeter = 2pie * r
    area = pie * r^2

    if either of these is given the other term can be calculated, therefore both statements are sufficient

    ans = d

    Thanked by: grandh01
    tisrar02 Master | Next Rank: 500 Posts
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    GMAT Score:
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    Post Mon Aug 13, 2012 6:47 pm
    1) Area= Pie*Radius squared.
    Since we are given the area, we can determine the radius as 5m and the diameter of G as 10m. If this is half of the inner circles Diameter then we can determine the area of the inner circle. SUFFICIENT

    2) We are given the diameter of the outer circle and again we know that it is HALF the diameter of the inner circle so we can figure out the area. SUFFICIENT.

    Answer: D

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