80 staff members were asked if they travel to school by bus or by walking.
32 of the staff members are teachers, the rest are support staff. 18 of the support staff walk. 30 of the staff members walk in total.
Use this information to complete the frequency tree.

One of the 80 staff members is chosen at random.
Write down the probability that this person is a teacher and walks.
28 exam-style questions on Edexcel GCSE Maths Frequency Trees. Each one has a worked solution and a mark scheme showing where the marks go.