In the sequence 3, 6, 9, ?, 15, 18, what number should replace the question mark?

A. 12

A, B, C, D, and E are seated in a row. A is to the left of B but not next to C. D is sitting next to E. Who is sitting at the extreme right?

D. E

If A=1, B=2, C=3, and so on, what is the code for the word 'CAT'?

A. 312

In a certain code, the word 'DOG' is coded as '47-15-7'. What is the code for the word 'FISH'?

A. 6-9-19-8

If the word 'HELLO' is coded as '8-5-12-12-15', what will be the code for 'WORLD'?

A. 23-15-18-12-4