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gmatblast
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A diagram has exactly two black dots and 1 green dot for 20 Aug 2004, 11:26
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A diagram has exactly two black dots and 1 green dot for every 2 red dots. There are no dots of any other color in the diagram. Which of the following could be the number of dots in the diagram?

(a) 3 (b) 18 (c) 36 (d) 45 (e) 52



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venksune
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A diagram has exactly two black dots and 1 green dot for 20 Aug 2004, 12:01
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Ans 45. D.

No. of dots have to be a multiple of 5 - 2:1:2 or 5X = no. of dots. Of the answer choices only 45 is multiple of 5.
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SigEpUCI
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A diagram has exactly two black dots and 1 green dot for 20 Aug 2004, 12:16
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agree, let R = # red dots

dots in diagram = R + (R/2 * 3).
=R + 3R/2
=5R/2

only one answer solves evenly for R.

D.
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gmatblast
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A diagram has exactly two black dots and 1 green dot for 20 Aug 2004, 12:26
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The OA is D. But isn't the language of the pronblem ambiguaous?

When I read the problem for the first time, I read it this way: there are 2 black dots. I considered them independent of the red and green dots. Then i considered the "1 green dot for every 2 red dots" part separately.



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