A man rows a certain distance downstream in 5 hours and

15         12        ?          9         21         6

147       138        120       93       ?       12

25 13.5 12.5 20.75 39.5 ? 302.25

Select the number from among the given options that can replace the question mark (?) in the following series.

64, 60, 52, 40, ?, 4

3 5 ? 75 1125 84375

14    16     20     15    25       13      29      9      32      6

Three series are provided below. You need to determine the values of A, B, and C and subsequently establish a relationship among them.

140     300     380      420      440      ?

21 11.5 13 ? 45.5 116.75

Direction: Which of the following will replace ‘?’ in the given question?

5, 18, ‘?’, 126, 296, 586, 1044