Anya wants to estimate the number of beetles in a woodland area.
She catches a sample of 25 beetles, marks them and releases them back into the woodland.
The next week, she takes a second sample of 40 beetles.
5 of these beetles have been marked.
Work out an estimate for the number of beetles in the woodland.
Write down an assumption you have made.
20 exam-style questions on Edexcel GCSE Maths Capture Recapture. Each one has a worked solution and a mark scheme showing where the marks go.