There are 4 black rabbits and twice as many grey rabbits as brown rabbits. If there are 16 grey rabbits, then what is the ratio of brown to black rabbits?   16 to 4   2 to 1   8 to 4   What is 51 percent of 492?   10.36   None of the choices   250.92   What is 46 percent of 75?   34.5   35   None of the choices   What is 15 percent of 200?   25   15   30   If there are 16 students and 2 teachers, what is the ratio of students to teachers in the class?   16 to 2   1 to 8   8 to 1