number series logical reasoning questions

In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much
11.

Look at this series: 1.5, 2.3, 3.1, 3.9, … What number should come next?
A.     4.2    B.     4.4
C.     4.7    D.     5.1

Explanation:

In this simple addition series, each number increases by 0.8.
12.

Look at this series: 14, 28, 20, 40, 32, 64, … What number should come next?
A.     52    B.     56
C.     96    D.     128

Explanation:

This is an alternating multiplication and subtracting series: First, multiply by 2 and then subtract 8.
13.

Look at this series: 2, 4, 6, 8, 10, … What number should come next?
A.     11    B.     12
C.     13    D.     14

Explanation:

This is a simple addition series. Each number increases by 2.
14.

Look at this series: 201, 202, 204, 207, … What number should come next?
A.     205    B.     208
C.     210    D.     211

Explanation:

In this addition series, 1 is added to the first number; 2 is added to the second number; 3 is added to the third number; 4 is added to the fourth number; and go on.