def add(a, b) puts "ADDING #{a} + #{b}" a + b end def subtract(a, b) puts "SUBTRACTING #{a} - #{b}" a - b end def multiply(a, b) puts "MULTIPLYING #{a} * #{b}" a * b end def divide(a, b) puts "DIVIDING #{a} / #{b}" a / b end puts "Let's do some math with just functions!" age = add(30, 5) height = subtract(78, 4) weight = multiply(90, 2) iq = divide(100, 2) puts "Age :#{age}, Height: #{height}, Weight: #{weight}, IQ: #{iq}" # A puzzle for the extra credit, type it anyway. puts "Here is a puzzle." what = add(age, subtract(height, multiply(weight, divide(iq, 2)))) puts "That becomes: #{what}. Can you do it by hand?" first = divide(iq, 2) second = multiply(weight, first) third = subtract(height, second) fourth = add(age, third) puts fourth puts " 24 + 34 / 100 - 1023 = ?" answer = subtract(add(24, divide(34, 100)), 1023) puts "#{answer}"