In Christchurch we have a Maths competition called Cantamath. Year 7&8 teams from all over Christchurch (about 90 teams in each year group) compete to answer tricky maths questions. We had a 'mock' competition today so our teams could practice and to give all Year 7&8 girls a chance to see what it's like. We had to answer 15 questions in 22 minutes. Here is one of the questions: Eight bricklayers can build a wall in 12 days. How long would it take 3 bricklayers, working at the same rate, to build the same wall?