This is the accepted version of the following article: [Eisenberg, T. (2015), Problems Section. School Science and Mathematics, 115: 256. doi: 10.1111/ssm.12127], which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/ssm.12127/abstract
Diaz-Barrero, J.L. [Solution to the problem] 5359. "School science and mathematics [en línia]", Maig 2015, vol. 115, núm. 5, p. 256.