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If r + s + t = r – u = s – t

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by sanju09 » Wed May 02, 2012 2:47 am
If r + s + t = r - u = s - t then which of the following statements are true?

I. r = -2t
II. s + t + u = 0
III. r + 2s = 2 · (s - t)

(A) I, only
(B) II, only
(C) III, only
(D) I and III, only
(E) I, II, and III



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by neelgandham » Wed May 02, 2012 3:46 am
If r + s + t = r - u = s - t

r + s + t = s - t, implies r =-2t
r + s + t = r - u, implies s + t + u = 0
r + s + t + s - t = 2 *(r - u) = 2*(s - t), implies r + 2s = 2 * (s - t)

IMO E
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