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Another positive integer puzzle (Posted on 2006-11-29) Difficulty: 2 of 5
Given that a, b, c, and d are positive integers, determine analytically if it is possible that 6(6a+ 3b + c) = 5d.

See The Solution Submitted by K Sengupta    
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D2? | Comment 1 of 2
For a D2 problem, it seems strange that no one has solved it yet! My guess is that it is not possible.  There is probably some not so obvious cheap trick needed to see this.
  Posted by Richard on 2006-11-29 21:32:47
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