Find the missing number in the series: 5, 10, 20, ?, 80

B. 40

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

A. 12

Bird is to Fly as Fish is to ?

A. SWIM

If 'A' is coded as '1', 'B' as '2', and 'C' as '3', what is the code for 'CAB'?

A. 312

If A + B means A is the brother of B, A - B means A is the sister of B, and A × B means A is the father of B, what is the relationship of C if A + C - B?

A. C IS THE SISTER OF B