# Question 9e94b

Oct 3, 2014

You can expect at most 16 colonies.

The dilution factor is 100 × 100 × 3 = 3 ×10^4.

So the concentration after the serial dilutions is

(4.74× 10^6"cells")/"1 mL" × 1/(3 × 10^4)# = 158 cells/mL

Then in the solution you apply to the plate, you have

0.1 mL × $\text{158 cells"/"1 mL}$ = 16 cells

You should expect to see at most 16 colonies on the plate.

For a good video on how to calculate serial dilutions, see