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Attached is scanned picture and solution from geometry DS

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Attached is scanned picture and solution from geometry DS [#permalink]

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05 Feb 2007, 05:14
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Attached is scanned picture and solution from geometry DS question GMAT official guide book.

Why is there an inference "Thus, if angle ABD has measure y, then x+y=2x" drawn?
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data-sufficiency-task.jpg [ 211.42 KiB | Viewed 779 times ]

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Re: DS - axplanation for the last (the most difficult) quest [#permalink]

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05 Feb 2007, 05:53
angle BAD must be given x which is not.
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05 Feb 2007, 07:16
there must be a missing given "clue". from the explanation provided i assume the added clue is that angle BAD is x.

i checked now the version of the OG i have and indeed, their picture says that BAD equals to x.
05 Feb 2007, 07:16
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