.
As presented, the post/(the problem) makes no sense,
but the sense returns back if to edit the condition in this way
Average of 9 figures is 301; average of first five figures is 163, and average of last 5 figures is 430. Find the value of the fifth figure.
replacing the " ? " mark by the number 9.
Also, it helps very much if to replace the word "figures" by the word "numbers".
Now the solution is as follows.
Solution
Let the 9 numbers are 
, 
, 
, 
, 
, 
, 
, 
and 
.
Then from the condition
P = + + + + = 5*163 and
Q = + + + + = 5*430,
while
R = + + + + + + + + = 9*301.
Next, it is clear that
P + Q - R = = 5*163 + 5*430 - 9*301,
and the last expression in the right side is equal to 256.
Answer. At given conditions, = 256.
Solved.
