What is the primary role of organic matter in soil?

44, 42, 46, 38, 54, ?

11           20           ?              64           112         192

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

Find the missing number (?) in the given number series.

4, 9, 19, 34, 54, ?

13, 14, 23, 48, 97, 178, ?

What should come in place of (?) question mark in the given number series.

5, 9, 17, 33, ?, 129

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

21, 42, 67, 96, ?, 166

81, 83, 87, 95, 111, ?

74, 84, 64, 104, ?, 184

Find the missing number in the given number series.

3, 7, 18, 38, 69, ?