if 4 x = 6 y = z , what is x + y , in terms of z ?
"4 x = 6 y = z x = z / 4 and y = z / 6 x + y = z / 4 + z / 6 = 5 z / 12 answer is b"
divide(subtract(divide(multiply(4, const_100), const_2), const_2), add(divide(multiply(4, const_100), const_2), const_2))