What letter comes next in the series: z, x, v, t, ?

A. R

Five students, P, Q, R, S, and T, submitted their projects in the following order: R submitted before P, S submitted before T, and Q submitted after P. What is the correct order of submissions?

A. R, P, Q, S, T

If A=1, B=2, C=3, ..., Z=26, what is the code for the word 'CAT'?

A. 3-1-20

Which number is different from the others?

C. 22

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

A. 3-1-20