Question

If 4,a b,28 are in arithmetic progression then the value of 'b' is
option
A. 20
B.19
C.23
D.12​

Answer 1

Answer:

20 is solution for this question

Answer 2

Given : 4,a,b,28 are in arithmetic progression

To Find :

the value of b  

A. 20. B.19. C. 23. D. 12.

Solution:

4,a,b,28 are in arithmetic progression

=> a - 4  = b - a  =  28 - b   = common difference

a - 4  = 28  -  b

=> a + b  = 32

a - 4  = b - a  

=> 2a = b + 4

=> 2a - b  = 4

 a + b  = 32  

2a - b =  4

=> 3a = 36

=> a = 12

b = 20

Value of b =  20

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