Multiple Choice Quiz

I had intended to create a large multiple choice quiz that included all of the site's content at one point but never got around to finishing it. I may at a later date.

Which of the following is a prime number?

1. 51
2. 4
3. 47
4. 192

The floor of a large restaurant is divided into four main dining areas. Half of these dining areas contain two smaller dining rooms each; the other half contain four dining rooms each. In half of the total number of rooms, 10 diners can be served, while in the other half of the rooms, 15 diners can be served. What is the maximum number of diners that the restaurant can accommodate?

1. 100
2. 125150175

If A × B = 24, C × D = 32, B × D = 48, and B × C = 24, what is the value of A × B × C × D?

1. 480
2. 576
3. 744
4. 768