Question

If $2 x , x + 8,3 x + 1$ are in A.P., then the value of $x$ will be.

• A. 3
• B. 7
• C. 5
• D. – 2

Answer 1

Answer: (C)

5

Answer 2

$2 x , x + 8,3 x + 1$ are in A.P.)

Therefore $( x + 8 ) = \frac { ( 2 x ) + ( 3 x + 1 ) } { 2 } = \frac { 5 x + 1 } { 2 }$

$\Rightarrow$ $2 x + 16 = 5 x + 1$ $\Rightarrow$ $3 x = 15$ $\Rightarrow$ $x = 5$.