00285nam a2200121Ia 4500100001600000490000600016654001700022245006300039260002600102082001500128300000800143546001200151  aYaglom/A.M   v1  amathematical  aChallenging mathematical problem with elementary solutions  bDoveraNew Yorkc1987  a511.6bYAG  a231  aENGLISH