Question

1. if a 10 ml portion of water developed 3 coliform bacteria colonies, what would be the number of colonies per 100 ml?

Explanation:

Step1: Set up proportion

Let \(x\) be the number of colonies per \(100\) mL. We have the proportion \(\frac{3}{10}=\frac{x}{100}\).

Step2: Solve for \(x\)

Cross - multiply: \(10x = 3\times100\). Then \(x=\frac{3\times100}{10}\).

Answer:

\(30\)