Sultan Abu Bakr Shah was from which of the following

15      8      9      15      32       ?       250.5

What will come in place of the question mark (?) in the following series?

146, 122, ? , 74, 50, 26

188        178       158      ?      88       38

5 6 15 40 89 170 ?

Find the missing number in the given number series.

 6, 13, 32, 87, ?, 737

What will come in place of the question mark (?) in the following series?

1.5, 3.5, 9.5, 27.5, 81.5, 243.5, ?

114, 156, ?,  238, 274, 304

204, ?,  120, 83, 52, 23

What will come in place of the question mark (?) in the following series?

29, 42, ?, 95, 135, 184