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GMAT Data Sufficiency (DS) | Re: In the figure above, what is the value of x + y ?

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manojISB wrote:

(1) x = 70.
(2) ABC and ADC are both isosceles triangles.

Per the 2nd statement , I think AB= BC and AD = DC so AB/BC = AD/DC = 1 or AB/AD = BC/DC =1 And ofcourse AC/AC =1 so triangles are similar?? am I wrong here?

Thanks.


From AB/BC = AD/DC = 1 you cannot write AB/AD = BC/DC=1 . AB/AD = 1 would mean that AB and AD have the same length which is obviously wrong.
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