A friend posted a math puzzle: "Find the smallest integer that ends in 56, is divisible by 56, and whose digits add to 56." Here's the Ruby script I wrote to solve the puzzle.

fiftysixpuzzle.rb

def digitsum num
  currentsum = 0
	(Math.log(num,10).ceil).downto(0) do |digit|
		currentsum = currentsum + num/(10**digit)
		num = num%(10**digit)
	end
	
	currentsum
end

leading_digits = 1

while true
	if (leading_digits*100+56)%56 == 0 && digitsum(leading_digits)+11 == 56
		break
	else
		leading_digits = leading_digits+1
	end
end

puts leading_digits.to_s + '56'