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# Need help with a maths question

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1. This is probably really easy but I don't get it. it's 3b the calculation question. The answer is 100000.
Thanks
2. (Original post by coconut64)
This is probably really easy but I don't get it. it's 3b the calculation question. The answer is 100000.
Thanks
60 out of 20000 are tagged, which is a proportion of 0.003. Thus we can estimate that the 800 total tagged fish represent a proportion of 0.003 (three thousandths) of the total population. Hence the total is 800÷0.003 = 266,666.666666..., so the book's answer is wrong.

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