The difference between the compound interest and simple

57 59 66 94 157 ?

8      24        12       ?      18         54

There are 3 series, you have to find value of a, b, c and then establish relation among a,b,c.

19, 25, 45, a, 553, 2767

The number of terms in the sequence 20, 25, 30, ….., 160 is:

43 ? 45 39 47 37

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

64, 60, 52, 40, ?, 4

2, 9, 19, 32, 48, 67, ?

31      32       41       66      115       ?

5 14 56 220 1125 6786