Challenge your mathematicians with this word problem about a game of darts between two friends. The rules of this game are a bit different: one player starts at a number below 30 and subtracts every throw. His opponent starts at 0 and adds with every throw. They tie after their second throws, which are each 10 points. Learners fill in a chart with possible scores each player may have started with to reach this tie. Once they have determined several options, they explain their process.