if 3 x = 6 y = z , what is x + y , in terms of z ?
"3 x = 6 y = z x = z / 3 and y = z / 6 x + y = z / 3 + z / 6 = z / 2 answer is a"
divide(subtract(divide(multiply(3, const_100), const_2), const_2), add(divide(multiply(3, const_100), const_2), const_2))