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Population

Answer :  30%

Another theory:
Let's calculate the minimum percentage of French-speaking individuals who also speak English in Burlington.

Given:
- **70%** of the population speaks English.
- **60%** of the population speaks French.

We want to find the minimum percentage of French speakers who also speak English.
To do this, we'll consider the overlap between the two groups.

Let:
- **E** represent the English-speaking population.
- **F** represent the French-speaking population.

We know that:
- **E = 70%** (English speakers)
- **F = 60%** (French speakers)

The overlap (individuals who speak both languages) can be represented as:
- **E ∩ F**

To find the minimum percentage of French speakers who also speak English, we'll use the inclusion-exclusion principle:

\[ E ∪ F = E + F - E ∩ F \]

Solving for **E ∩ F**:
\[ E ∩ F = E + F - E ∪ F \]

Substitute the given values:
\[ E ∩ F = 70% + 60% - 100% = 30% \]

Therefore, the minimum percentage of French-speaking persons who also speak English is **30%**.

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