If the Operating Ratio of a firm is 80% and Net Sales

45      45.5        47         49.5        53         ?

What value should come in the place of (?) in the following number series?

56, 28, 28, 42, 84, ?

32      48      96     ?     720     2520

18,  37,  60, ?,  120,  157

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

25, 25, 5, 10, 2, ?

?, 6, 6, 9, 18, 45

30           162         344         ?              890         1270

155, 157, 160, ?,  172, 183

What will come in place of (?) Question mark in the given number series.

1, 2, 5, 14, 41, 122, ?

In each of the following number series, one term is missing. Find the missing term.

7, 14, 28, 56, 112, ?