# Simple Arithmetic: Ages of programming languages

### Ages of programming Languages

Clojure was 10 years old in 2017, so its age can be represented as the number `10`

Can you write some simple Clojure to calculate the total number of years from all the following languages

• Clojure (10 years)
• Python (26 years)
• Javascript (21 years)
• Java (22 years)
• Ruby (22 years)
• C (45 years)
• C++ (34 years)
• Lisp (59 years)
• Fortran (60 years)

You can use the list of years here as a convenience `10 27 26 21 22 22 45 34 59 60`

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The simplest way to calculate the total is to simply add the age of each language together

``````(+ 10 27 26 21 22 22 34 45 59 60)
``````

As there are two values the same, we could also calculate the total as follows

``````(+ 10 27 26 21 (* 22 2) 34 45 59 60)
``````

### Average age of programming languages

Calculate the average age of the 10 programming languages

For example, you could simply divide the total age of all languages by 10, as there are 10 languages.

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``````(/ (+ 10 27 26  21 22 22 45 34 59 60)