Priya wants to find an estimate for the number of birds in a wood.
She catches 100 birds and puts a ring on each of their legs.
She then releases the birds back into the wood.
A week later, Priya catches another 80 birds.
20 of these birds have rings on their legs.
Work out an estimate for the number of birds in the wood.
Write down an assumption you have made.
Practise Edexcel GCSE Maths Capture Recapture with exam-style questions for Foundation and Higher tier. 20 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.