You may also like

problem icon

Epidemic Modelling

Use the computer to model an epidemic. Try out public health policies to control the spread of the epidemic, to minimise the number of sick days and deaths.

problem icon


bioNRICH is the area of the stemNRICH site devoted to the mathematics underlying the study of the biological sciences, designed to help develop the mathematics required to get the most from your study of biology at A-level and university.

problem icon

Mixed up Mixture

Can you fill in the mixed up numbers in this dilution calculation?

Dilution Series Calculator

Stage: 4 Challenge Level: Challenge Level:1

This interactive diagram shows a dilution series made from four dilutions of an initial bacterial solution. At each stage of the dilution, a quantity of the culture is diluted with a quantity of the medium

If you can see this message Flash may not be working in your browser
Please see to enable it.

Try to calculate the dilution factor for various combinations of initial numbers. Can you create a general rule for the overall dilution? (Full screen version )

Other problems

Investigating the Dilution Series