There are 5 boxes having distinct weights. A person needs to find out the sum of their weights taking 2 boxes at a time. If his results are 17,21,16,15,18,12,12,13,7,9. Then find out the weight of the 2nd heaviest and 4th heaviest....????
This is an old puzzler, slightly re-packaged. It is customarily presented in terms of hay bales (dunno why), and the weights will vary from one presentation to another. Fortunately, being old, solutions to this puzzler are archived online!