In a class, every student speaks English or French: 20 students speak English, 15 students speak French, and 10 students speak both. How many students are there in the class?

**Subject Computer Science Discrete Math**

In a class, every student speaks English or French: 20 students speak English, 15 students speak French, and 10 students speak both. How many students are there in the class?

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How many students are there in a class if some speak one language and some speak another, expressed using inclusion/exclusion (counting)?...

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