In a cooking contest, Chef A finishes before Chef B but after Chef C. Chef D finishes after Chef A. What is the sequence of chefs from first to last?

A. C, A, B, D

In a coding system where Z=26, Y=25, X=24, what is the code for the word 'DOG'?

B. 4-15-7

In a coded relation, A + B means A is the daughter of B, A - B means A is the son of B, and A × B means A is the grandfather of B. What is the relationship of C if A + C - B?

A. C IS THE SON OF B

In the sequence 5, 10, 15, 20, 25, 30, how many times does the number 20 occur?

A. 1

M is the grandmother of N. N has an uncle O. How is O related to M?

A. SON