Answer: 150,000,000 bacteria are on the soap piece before dilution.
Explanation:
The dilution factor is 1:1,000,000 or (1/1,000,000) This means that the 1g of soap was diluted 1,000,000 times.
After 24 hours, there are 150 colonies.
To get the number of bacteria before dilution, we simply multiply the number of colonies by the denominator of the dilution factor which is 1,000,000. We have:
150 x 1,000,000
= 150,000,000
Therefore, there were 150,000,000 bacteria before dilution.
