What approximate value should come in the place of question mark (?) in the following question?

(59.99% of 3499.99) + {(19.92% of 1224.95) ÷ 4.95} = ?

What will come in place of question mark ( ? ) in the following series?
656, 352, 200, 124, 86, ? 

Direction: What should come in place of the question mark (?) in the following number series?
0.5, 2, 9, 35, 104, ?

What will come in place of question mark ( ? ) in the following series?
13, 25, 61, 121, 205, ? 

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

15     18    16   19     17    20    ?

Direction (66-70): What should come in place of the question mark(?) in the following number series?

10    11    13    21    69    ?

What should come in place of the question mark '?' in the following number series?

46, ?, 284, 345, 378, 391