Or search by topic
Thank you Tom from Wolgarston High School, Hidayah who does not name a school, Hamish and Jared from Ulverston Victoria High School, Eduardo from The British School, Manila, Justin from Skyview High School, Billings, MT USA and Fabian from Sabino High School in Tucson, Arizona, U.S.A. for sending your very good solutions to this problem.You all tackled the problem in a similar way.