As given by the question,
There are given that three test score, verbal reasoning score, quantitaive reasoning score and an analytical writing score.
Now,
Let v is the averahe verbal reasoning score, q is the average qualitative reasoning score, and A is the average analytical writing score.
Then,
From the given problem statement
Suppose analytical reasoning score is x
Then,
The verbal reasoning score is:

And,
The quantitative reasoning score is:

Now,
The sum of the three average scores was 314.4
S,

x=10, this is the analytical score.
Then,
For the verbal score, put x=10 into the equation of verbal
So,

And,
The quantitative score is,
Put the value of x into the equation of quantitative
So,

Hence, the average score of analytical is 10, the average score of verbal is 151.5 and the average score of quantitative is 152.9.