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Sum from Arithmetic and Geometric (Posted on 2016-03-24) Difficulty: 3 of 5
Each of A, B and C is a positive integer such that:
20*A, 6*B and C are in arithmetic sequence, and:
20*A, 6*B and C+1 are in geometric sequence

Find the six smallest values of A+B+C

No Solution Yet Submitted by K Sengupta    
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re(2): Possible Solution | Comment 3 of 5 |
(In reply to re: Possible Solution by Brian Smith)

 (A,B,C) = (80, 780, 1520) doesn't yield the required progressions when A is multiplied by 20 and B by 6.
  Posted by Charlie on 2016-03-24 15:27:09

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