if the product of the integers w , x , y and z is 840 , and if 1 < w < x < y < z , what is the value of w + z ?
"840 = 4 * 5 * 6 * 7 so w = 4 , x = 5 , y = 6 , z = 7 w + z = 4 + 7 = 11 answer - b"
subtract(subtract(subtract(subtract(subtract(subtract(subtract(subtract(subtract(subtract(subtract(subtract(divide(divide(840, const_2), const_2), const_1), const_1), const_1), const_1), const_1), const_1), const_1), const_1), const_1), const_1), const_1), const_1)