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 becomes: ", what, "Can you do it by hand?")

