having a go at creating a module to work out the number of boxes are needed for the number of matches past in - this is for the learning functional programming with elixir book

match_stick_factory.ex

defmodule MatchStickFactory do
    
    def boxes(number_of_matches) do
        number_of_matches_in_big = 50;
        number_of_matches_in_medium = 20;
        number_of_matches_in_small = 5;
        number_of_matches_remaining = number_of_matches;
        {number_of_big_boxes, number_of_matches_remaining} = divide(number_of_matches_remaining, number_of_matches_in_big)
        {number_of_medium_boxes, number_of_matches_remaining} = divide(number_of_matches_remaining, number_of_matches_in_medium)
        {number_of_small_boxes, number_of_matches_remaining} = divide(number_of_matches_remaining, number_of_matches_in_small)
        %{
            big: number_of_big_boxes, 
            medium: number_of_medium_boxes, 
            small: number_of_small_boxes, 
            remaining: number_of_matches_remaining
        }
    end
    
    def divide(dividend, divisor) do
        {div(dividend, divisor), rem(dividend,divisor)}
    end
    
end