# -*- coding: utf-8 -*-
#Exercise 21: Functions Can Return Something

def add(a,b):
	print "Adding %d + %d"%(a,b)
	return a+b

def substract(a,b):
	print "substracting %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 "let's do some math with just functions."

age=add(30,5)
height=substract(78,4)
weight=multiply(90,2)
iq=divide(100,2)

print "Age: %d, Height: %d, Weight: %d, IQ: %d."%(age,height,weight,iq)

print "Here is a puzzle."

what = add(age,substract(height,multiply(weight,divide(iq,2))))

print "That becomse: ",what,"Can you do it by hand?"