text: def add(a, b):
  	print ("Adding %d + %d" % (a, b))
  	return a + b
  
  def subtract(a, b):
  	print ("Subtracting %d - %d" % (a, b))
  	return a - b
  	
  def multiply(a, b):
  	print ("Multiplying %d * %d" % (a, b))
  	return a * b
  	
  def divide(a, b):
  	print ("Dividing %d / %d" % (a, b))
  	return a / b
  
  print ("Now Let's do some math with just functions!")
  	
  age = add(30, 5)
  height = subtract(78, 4)
  weight = multiply(90, 2)
  iq = divide(100, 2)
  
  print ("Age: %d, Height: %d, Weight: %d, IQ: %d" % (
  	age, height, weight, iq))
  	
  # A puzzle for the extra credit, type it in anyway.
  print ("Here is a puzzle.")
  
  what = add(age, subtract(height, multiply(weight, divide(iq, 2))))
  
  print ("That becomes:", what, "Can you do it by hand?")