Direction: Study the following information carefully and answer the questions given below:
Eleven persons buy things one after another. Only five persons buy things after P. Three persons buy things between P and Q. R buy things after S and before T. There are as many persons buy things before U as after V. More than three persons buy things between W and X who buy things just after P. Y buy things before Z and after R. No one buy things after T. Y buy things just after V. U buys after Q.

Who among the following buy things between X and Z?

Select the option that is related to the third number in the same way as the second number is related to the first number and the sixth number is related to the fifth number.
 10 : 0 :: 12 : ? :: 16 : 3 

Select the number from among the given options that can replace the question mark (?) in the following series.
 16, 32, 14, 19, 37, 21, 22, 42, ?, 25, 47, 35 

2, 6, 12, 20, 30, 42, 56, ?

Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
TOM, UMP, VKS, ?, XGY

The second number in the given number pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) are followed in all the number pairs, EXCEPT one. Find that odd number pair.

A series is given with one term missing. Choose the correct option from the given options and complete the series.
5, 6, 9, 15, ?, 40

Find the next expression in the series: 

ABZ, ABBYZ, ABBBXYZ, ______?