Identify the missing letter in the series: Z, X, V, T, ?

B. S

Complete the series: B, D, F, H, ?

A. J

What comes next in the series: M, O, Q, S, ?

B. T

Find the odd one out in the series: A, E, I, O, U, X

D. X

If A + B means A - B, A - B means A × B, A × B means A ÷ B, and A ÷ B means A + B, what is the value of 10 + 5?

A. 5