300 students are asked how they get to school. All of the students either walk to school or get the bus to school.
k% k\%\,k% of the students walk to school. 45% of the students are boys. 21% of the students are boys who get the bus to school.
Work out, in terms of kkk, how many girls walk to school.
159 exam-style questions on AQA GCSE Maths Two Way Tables. Each one has a worked solution and a mark scheme showing where the marks go.