if 3 : 12 : : x : 16 , then find the value of x
explanation : treat 3 : 12 as 3 / 12 and x : 16 as x / 16 , treat : : as = so we get 3 / 12 = x / 16 = > 12 x = 48 = > x = 4 option b
divide(add(multiply(12, 3), 12), 16)