Priya wants to find an estimate for the number of ants in a colony.
She catches 80 ants from the colony and marks each one with a dye.
She then returns the ants to the colony.
A week later, Priya catches another 80 ants.
16 of these ants are marked with the dye.
Work out an estimate for the number of ants in the colony.
Write down an assumption you have made.
87 exam-style questions on Eduqas GCSE Maths Capture Recapture. Each one has a worked solution and a mark scheme showing where the marks go.