Javascript programs

Does anyone know how to do JavaScript programming, if so can you help me to do these programs

I would be grateful if anyone could do these as soon as posible this is why i have awarde 500 pts to this question

1) This is asking you to input a number between 1 and 20 and it gives you your answer here is some code i have done

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2) A program that prompts a user to enter 5 numbers which are the number of people entering a exbition. Here is the code i have done so far