600 students are asked how they get to school. All of the students either walk to school or get the bus to school.
55% of the students walk to school. 47% of the students are boys. 23% of the students are boys who get the bus to school.
Work out how many girls walk to school.
159 exam-style questions on OCR GCSE Maths Two Way Tables. Each one has a worked solution and a mark scheme showing where the marks go.