Survo puzzles: www.survo.fi/puzzles
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Copyright (c) Survo Systems 2006-2013

The easiest way to solve these three problems may be
using a Java Applet
http://www.survo.fi/swap/puzzles.html
based on the swapping method.

Survo puzzle 303/2013 (30) #332-65990

   A  B  C
1  *  *  * 15
2  *  *  * 20
3  *  *  * 10
   9 24 12

Survo puzzle 304/2013 (65) #343-12474

   A  B  C  E
1  *  *  *  * 24
2  *  *  *  2 17
3  *  *  *  * 37
  11 23 31 13

Survo puzzle 305/2013 (230) #353-78985

   A  B  C  E  F
1  *  *  *  *  * 38
2  *  *  *  *  * 18
3  *  *  *  *  * 64
  33 28 20 15 24