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

B. 40

If the sequence is A, C, E, G, what is the next letter?

B. H

In a sequence where each term is the sum of the previous two terms, if the first term is 2 and the second term is 3, what is the fifth term?

A. 13

What comes next in the series: Z, Y, X, W, ?

A. V

In the series 2, 4, 8, 16, what is the next number?

B. 32