Carlos wants to find an estimate for the number of ants in a colony.
He catches 50 ants from the colony and marks each one with a dye.
He then returns the ants to the colony.
A week later, Carlos catches another 60 ants.
8 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 WJEC GCSE Maths Capture Recapture. Each one has a worked solution and a mark scheme showing where the marks go.