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10 Apr 2010, 04:50
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Triangle.PNG
In the triangle above, what is the length of the side BC?(1) Line segment AD has length 6
(2) x= 36
Can someone please explain the logic behind the explanation given in the official guide for the quantitative review-1st edition (question #117).
What I can't understand from the explanation is that it has been assumed that
angle ABD + angle DAB = 2x
will imply that ABD = DAB =x.
Why is the above true? Isn't it possible that ABD = 1.5x and DAB = 0.5x?
Why those two have to be equal?
PROPER VERSION OF THIS QUESTION IS HERE: in-triangle-abc-what-is-the-length-of-side-bc-106669.html
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10 Apr 2010, 05:30
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LM
We can no way assume that ABD=DAB=x, from ABD+DAB=2x. If we knew that either ABD or DAB equals to x, then the answer would be A. But in it's current form the answer should be E.
10 Apr 2010, 17:28
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Bunuel
This means that the Official Guide has the wrong answer. Official Guide gives the answer as "A", but I thought ( same as you!) that the answer should be"E".
whom shall we inform if the answer in the Official Guide is wrong?
