Did you solve it? Are you smarter than a Brazilian 15-year-old?
(The Guardian Brazil)

The answers to today´s puzzlesOn my puzzle blog earlier today I set this question from Brazil´s State School Mathematics OlympiadHomero is clutching three identical pieces of string in his fist, as illustrated below left. He asks Sofia to tie two ends of the string, chosen at random, at either side of his fist, as illustrated below centre, so that there is one free end at either side. Continue reading...