In a committee, 50 people speak French, 20 speak Spanish and 10 speak both Spanish and French. How many speak at least one of these two languages?

Explanation

To solve the problem of how many people in the committee speak at least one of the two languages (French or Spanish), we can use the principle of inclusion-exclusion. Here’s a step-by-step solution:

### Step 1: Define the Sets
Let:
- \( F \) be the set of people who speak French.
- \( S \) be the set of people who speak Spanish.

From the problem, we know:
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