Project Euler problem #1 : "Find the sum of all of the whole numbers less than 1000 that are multiples of either 3 or 5." I thought that problem was too quick, so I generalized it to "Find the sum of all of the whole numbers less than n that are multiples of either x or z," then ran n=1000,x=3,z=5.

countofmultiples.rb

def countofmultiples (num,firstfactor,secondfactor)
  count = 0
	1.upto(num-1) do |check|
		if check % firstfactor == 0 || check % secondfactor == 0
			count += check
		end
	end
	
	count
end

puts countofmultiples(10,3,5)
#=>23
puts countofmultiples(1000,3,5)
#=>233168