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

100 100   50  150  37.5 ?

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

100  99  95  86  ? 

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

1  2  6  15  31  ? 

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

2  4  11  37  ? 

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

217 344 513 730 ?

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

60.75, 40.5, 27, 18, 12, ?

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

? , 8, 14, 34, 76, 148

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

201, 199, 192, 175, 143, ?