Answer:
She should get 91 scores.
Explanation:
Let x be the score meg get on fourth test,
Given,
She scored 45, 48, and 56 points on three tests.
Thus, the total sum of the scores in four test = 45 + 48 + 56 + x
= 149 + x
Also, the number of tests = 4,


According to the question,

( By Cross multiplication )
( Subtracting 149 on both sides )
Hence, she should get 91 scores on the fourth test to get an average score of 60.